> Of the 42 names that moved toward girls, 34 were driven mainly by an increase among girls, rather than a decline among boys.

> Surprisingly, the same pattern held in the opposite direction. Of the 12 names that moved toward boys, 9 shifted mainly because fewer girls were receiving them, rather than because more boys were. In other words, whichever way a name moved, the biggest change usually came from girls.

This is consistent with the observation that girl's names are more dynamic.

I have no data but feel that boys tend to get the family names and biblical names (in US anyways). It's rare to hear of a girl named Elizabeth III or Mary Junior but quite common for those concepts in boys. So I think the boy names are heavily weighted on probably the most popular ~25 or so names. Since girl names are more free to follow whatever is fashionable at the time, trends move faster.

My son is named after his grandfather, and it's an overly common name in English (American and British). Definitely a top 3 most common for last several centuries

Anecdata: I’m a guy and a III. My son almost was a IV but we chose another first name and used my (and my dad’s and my grandfather’s) name for his middle name. My great grandfather had a different name, but I think his dad and maybe grandfather had the same name as me.

I’d agree the trend is waning if that’s what you’re getting at but I think it is baked into the history of this dataset and is also still significantly more common for boys than girls

Also, IV is really quite rare for boys too. Junior still super common.

It seems there are lots of cases across the board where "women adopt traditionally male thing" has become the norm in this timeframe but not many where "men adopt traditionally female thing" at quite the same rate or scale.

> This is consistent with the observation that girl's names are more dynamic.

Interesting, I wonder what causes this? In the US, is more common to name the first son after the father. Given this data comes from US social security information, that definitely has an impact.

There are a few names I think are being confused. Jan, short for Janice is a female name, but Jan in Central / Eastern Europe as a form of John is masculine. Jean the female name and Jean the french male name are different.

I was going to say the same about Jean; I think that one at least is hard to really draw conclusions from without additional data like languages spoken at home.

Anecdotally, the boy->girl names are almost all very popular names where I've met multiple each of those across different ages, whereas the other two categories feel like they have a lot more down-list entries.

Yeah immigration and mix of similar names from different languages could also be reasons for the (at least perceived) shifts.

This is part of what they mean by girl names driving the shift. You have a traditional ethnic name that may be masculine or feminine and has a baseline low level of popularity. Then you have a popular female name that rapidly gains and loses its popularity. The effect on the mix is that it's shifting from masculine to feminine, but really you should look at it as a newly-popular female name being layered on top of the traditional name. And you can often see this in the timescale, with a clear pop-culture trigger leading to the rising girl name.

Looking at just part of the data, I can see this with Arya (Stark, Game of Thrones), Paris (Hilton), Stevie (Nicks, of Fleetwood Mac), Dakota (Fanning), and Tatum (O'neal), and the masculine trend also relates to the fading of generationally-popular names like Jean (Silent/Boomer), Pat (Boomer), Joan (Silent/Boomer), Courtney (Gen-X/Xennial), etc.

There was a guy at my school named Hilary who got awful abuse for it. Always wondered why parents would do such a thing to a child.

As someone with an pretty unusual name, I think kids will always find a reason to make fun of you and it isn't always just the name.

True Story: My mom was a 2nd grade teacher for 30 years and in the 70s had a student with very 'hippie" style parents. They named their son Log Cabin. You can imagine how that went over in elementary school.

I suspect this is a big driver of the switch. Parents that do not want to give their boys a name that will cause issues later on.

Back in school it wasn't a problem, people knew "Loren" was male, "Lauren" was female. Now, an awful lot of people don't. It's an uncommon enough name that even if you were around back when that's how it worked you very well might not have known it.

As an adult I routinely get misgendered, but it's a so-what to me.

Loren adjacent. In high school my girlfriend was Lauren and mine is Lorin. Friends over pronounced our names to differentiate. It doesn’t bother me to get misgendered, either. It never lasts past hearing my voice or seeing me, though.

Here's my favorite "Lauren"*: https://en.wikipedia.org/wiki/Lauren_Bush

*solely because her legal, married name is Lauren Bush Lauren. She actually changed it, which is gold (and honestly very sweet).

How "not long ago" are you thinking of? Clinton was first a major figure in the 90s (and we also had https://en.wikipedia.org/wiki/The_Fresh_Prince_of_Bel-Air ). And Clinton herself is from the baby boom generation; what male Hil(l)arys from that cohort do you have in mind?

Looks like it flipped in ~the 40s, by the ~60s had become rarer as a male name, and was pretty much a flop as a male name after the ~80s. So Clinton was born just when it started to take off for females (and in general - it was never as common as a male name) and there should have been in the same ballpark as as many male "Hilary"s of the same age.

https://namedaisy.com/us/name/Hilary

It's kind of surprising that this is even allowed. A lot of countries require at least the first given name to match the gender. Some names might be deemed suitable for both genders.

In the USA, you can name your kid what you want. This avoids one ethnic group requiring everyone to have a name from their tradition.

We associate names ending with a vowel sound with the female gender. Other than that there's nothing gendered about "Hilary" as a first name.

https://en.wikipedia.org/wiki/Hilary_(name) - It's not an exclusively female name. But in the US, you can give a kid pretty much any name you want (see the names Musk gives his kids these days).

My biggest WTF on this (as a foreigner) was the late Lindsey Graham. I always knew Lindsey/Lindsay as a female name.

Either way, peeking through the list, seems to me names which end with a vowel are usually feminine. However, there's a caveat: names end up shortened, and over time even those get shortened.

'Brit', 'Britney' for 'Brittany'.

'Gerry' or 'Geri' or 'Ger' for 'Gareth' (Dutch variant: 'Gerrit'),

'Pat', 'Patty' for 'Patrick', 'Patricia'.

'Pen', 'Penny' for 'Penelope'

'Ash' for 'Ashley'.

'Tash' or 'Tasha' for 'Natasha', 'Nata(s)cha' (a variant of Nathan/Nathaniel?)

'Toni', 'Tony', or 'Ton' for 'Antonia', 'Anton', or 'Antonius'.

Skimming through the quick examples I came up with, one thing stands out: if it ends with an 'a', feminine. I believe this stems from Latin? It also appears Brittany is a very British example, whereas say 'Tony' stems from a Catholic background. People with that background get very traditional names, but they're always practically shortened. Annoyingly, you'd have to mention your complete name on say a form, but otherwise you get a wider choice since you have like three names, and they're relatively long so more variety to pick from.

Lindsey (as well as Ashley, Tracy, Kelly, among others) are all, I believe, last names that became given names. They skewed female over time because they end with a vowel.

Ashley Williams is the name of two American actresses as well as two male soccer players (Welsh and Liberian) and a male boxer (also Welsh).

Ends in 'a' = female: a relatively safe assumption, as far as an assumption here can be safe, with no other context. A strong majority in many places will match that. Many of the exceptions will be obviously foreign names with traditional spelling, which can go either way (may follow that culture's patterns, may not, highly varied).

Ends in vowel = female: probably mostly true, in that it may be >50%, but it's unreliable enough that I'd avoid trying to base any assumptions off it.

Names really follow no rules at all here. For both good and bad. E.g. most recently I ran across a "La-sia" pronounced "ladashsia". If it's spelled vat-ik'Nff and pronounced "King George" and they're female, then that's what's correct.

The one that always trips me up is when a man is a Stacey.

Growing up in the rural midwest, I had no idea Tracy could be a dude's name until I worked with one. (Great guy, btw.)

I had to call a customer once whose name was Courtney and it tripped me up when it turned out to be a male..

Andrea, Simone, Nicola, Michele, Daniele in Italian are all male names, but English speakers would probably assume the person is female from the name alone.

True, good native and traditional cultutal exceptions of a rule of thumb. Speaking for myself (NL) we have a small amount of Italian names and heritage (also due to Catholicism), and say NYC would have much more Italian descendants.

Also, as someone who saw quite some football (non-US version), I ofcourse am familiar with a lot of names. For example, Andrea Pirlo. We also learn some via history at school, since Italy plays a prominent role in Europe's history. Regarding Nicola, people might be familiar with Nikola Tesla (the 'c' in this case, sounds like 'k') and it is just a variant of 'Nico', 'Nicole', 'Nicolas'. Then there's some dude at FIFA, 'Gianni' which is a variant of 'Jean', 'Jan', 'Jeanne', 'Janet', 'Jannie', 'Janine', etc. I could go on about Gianluigi Buffon...

What I just remind myself with regards to Italian is it tends to add a vowel at end of a word or name, but it often doesn't sound same in English or my native tongue (Dutch).

But Jean (English name, like Jeannie) and Jean (French form of John) are entirely different names, with different pronunciations, that happen to share the same spelling.

Yep, my wife and I have the same middle name: Jean. I’m French and she’s British :)

I feel like a lot of these can be tied to one famous person with the name causing the gender to flip.

Most interesting thing that stands out to me is the number of names that appear to be what I would consider an abbreviation of a more traditional name.

e.g. “Pat” is cited, but doesn’t specify whether that refers to Patricia or Patrick.

These are presumably from Social Security registrations, so reflecting official given names.

Another interesting analysis would be the movement back and forth between full names and their associated common diminutives.

Yes, the data comes from the US Social Security Administration from 1936–2025

Source: The expandable "How we measured it" section at the bottom of the page

Common nicknames eventually just become given names on their own, like "Jack" or "John" or "Alex".

I was very much shocked to see a feminine version of my name used IIRC on Dead Or Alive 4 (DOA4), not knowing the backstory: I think it was a character called Leon was promising to avenge his dead girlfriend, Rolande.

I've wondered if the women that have carried the name have liked it? In my mind, it's always sounded very blunt so as to be feminine, but I recognize I'm heavily biased when it comes to my own name.

It's super hard to keep track of, I have an app that's designed to help couples name their baby, and I always wanted to stay away from hard-defined gender stuff, but people still want boy/girl categories. So many are both, but to varying degrees. I ended up using a boy/girl/unisex selector, and had Jev tag all the names. It's especially when dealing with other countries, languages, and customs. At the end of the day, it's mostly easier for the user to just swipe left on a name rather than try to pre-eliminate it from their pool.

Interesting data. Nightmare color scale for the colorblind.

Came here to say the same. Anyone doing data visualization should think long and hard before using something beside a line or bar chart. Almost everything else is worse in multiple ways.

Most of the names that flip over seem to be names associated with the gentry class, many of the names seem to be neutral, soft very inoffensive names.

Most surprising was "Mario" becoming shared. "Maria/Mario" seemed inherently gendered, based on the last letter.

Interestingly if I remember correctly they have different origins, Maria is a biblical name, while Mario comes from Latin (which can decline Marius to Maria, but that’s a different word)

I think it says "Marlo"? Not "Mario". L, not I.

Marlo/Marla is also inherently gendered

for people from languages that mark gender with an ending (romance languages for instance), putting the "wrong" ending something like a noun would sound odd or change the meaning

I'm just really surprised that 21% of Lynn's are boys.

Probably more likely that they don't get the interview because the person reviewing their CV assumed they were a woman...

I've noticed more girls are being named Parker these days. My 1yo son is named Parker. He's holding the line.

The trend of surnames as given names is stranger to me than traditional gender reversal of names.

They go hand-in-hand. Surnames aren't gendered. Names that reverse gender are often surnames used as given names.

"John" or "Matthew" are probably never going to become female. Nor will "Elizabeth" or "Katherine" become male.

"Spencer" was male when Spencer Tracy was a big name. Today it could go either way. As a family name it relates to the profession of a steward.

Surnames or occupations (Tanner, Cooper, etc)

A name I was surprised by was someone I know naming their daughter Miles/Myles, which is such a male name in my mind. It might even be based on the Latin word for soldier. It's not one I've seen used for a girl anywhere else, yet.

Edited slightly for series spoilers:

> "Well, I wish you every joy," Miles went on [...] He managed a wink. "Name the first one after me, eh?"

> [She] grinned. "I'm not sure she'd appreciate that. Milesanna? Milesia?"

> "Milesia sounds like a disease," Miles admitted, taken aback. "In that case, don't. I wouldn't want her to grow up hating me in absentia."

-- Memory (1996) by Lois McMaster Bujold

In the series, Miles having a name meaning "soldier" is, er, persistently thematically significant.

I'm gonna credit George RR Martin with flipping Arya in the mid '90s

Good luck to the Perl function Text::GenderFromName()

Maybe it needs the birthday

I guess it's eternally stuck in the 90s. I didn't see Perl in a long time now. 10-15 years ago it was still everywhere.

edit: No, it's stuck in the 80s: "The data comes from a 5% sampling of Social Security card applications with dates of birth from January 1980 through December 1989"

https://metacpan.org/pod/Text::GenderFromName#REGARDING-THE-DEFAULT-LIST

I'm sure there are a few competing "Falsehoods programmers believe about names" out there by now.

Stevie is a girl's name now?

Such a thing will often happen as the result of a celebrity having the name. For instance, famed Fleetwood Mac singer Stevie Nicks, whose real name was Stephanie.

Years ago, one of the broadcasters for a Red Sox game was doing some ad read about some event Stevie Nicks was going to be at, but they read her name as "Steve Nicks" instead. Someone else in the booth corrected them, and they responded "I know him well, and I call him Steve". A fan apparently sent them a giant poster of Stevie Nicks, and the others put it up in the booth and teased him about it relentlessly during the next game.

The past tense "was" had me at least looking for an obituary. She is still very much alive

I was referring to the Stephanie part in the past tense. I doubt she's gone by that name since she was a child.

But yes, Stevie is very much still alive.

Interestingly enough, Lindsey, like Lindsey Buckingham, the guitarist of Fleetwood Mac, became a more popular girl's name during Fleetwood Mac's heyday.

In the US, boys would abbreviate Stephen or Steven to Steve. Stevie only for a young boy.

I’m not sure what they are measuring here though - if it’s only birth certificates then I’m sure Stevie is dominated by girls for a long time.

With the shift happening right after the 1976–1980 square, I'd assume people named their daughter after Stevie Nicks.

I mean, this is US-centric data, but it is probably a shortening of 'Stephanie' or 'Stefanie' [1], the female variant of 'Stephan' or 'Stefan'. It stems from Greek, apparently: Stephanos. Its variant are used entirely throughout Europe, from Portugal to Russia.

[1] https://en.wikipedia.org/wiki/Stephanie

What about Aaron -> Erin ?

Aaron is Hebrew and Erin is Irish. They just happen to sound the same.

They don't even sound the same, except in some (not all) American accents. They don't sound even remotely similar to me.

I thought they did not, but after actually vocalizing them I would say they are basically indistinguishable in real (fast) speech.

Interesting, they sound exactly the same to me, and I cannot even think of how they might sound different to someone else. Care to explain?

To my Irish ear, these are two completely different names, not even slightly similar. (They're also etymologically unrelated.) It blew my mind when discussions on r/namenerds revealed that many Americans consider these names similar or even identical.

Sort of reminds me of the color swap of Pink and Blue for Men and Women.

Surprised to not see "Jordan" in there, it's the first one that came to my mind.

Green to orange? Why not blue to pink? I know it is stereotypical, but it is the natural colouring.

I'm not sure what you mean by "natural" coloring, but the association you're describing has also reversed over time; i.e., pink was considered masculine and blue was considered feminine.

https://en.wikipedia.org/wiki/Gendered_associations_of_pink_and_blue