Over the past few months, I’ve been writing about political polarization and baby naming practices in the United States (see HERE for the most recent piece). A consistent pattern kept showing up: some names appear overwhelmingly more common in Republican-leaning states, others in Democratic-leaning ones. But every time I plotted those patterns, an uncomfortable question hung over the whole exercise: how much of what I was calling “political polarization” was really just the geography of population density? After all, Democratic vote share and urbanization overlap a lot. Maybe the patterns have less to do with cultural politics and more to do with the distribution of people.
To get at that, I needed a way to peer beneath the state-level and estimate where babies with specific names actually live. The SSA data only provide state counts. But the CDC publishes county-level birth totals, and the USDA classifies every county by its degree of urbanization (see this post for more on how I attempted to put these together). If I could use the CDC county counts to distribute the SSA state numbers downward, I’d have a rough and imperfect way to estimate where babies with particular names are born. That gave me a way to see whether the patterns I’ve been writing about reflect political geography, population geography, or some mix of the two.
The strategy is simple: for each state, I calculated what proportion of births occurred in each county. Then I treated those proportions as weights, redistributing each SSA name count across counties proportionally. It’s not perfect. Babies with any given name are not literally distributed across counties in proportion to all births. But it gives us a workable baseline, a sort of null model of what geography alone would produce. When names diverge strongly from this baseline, that’s maybe evidence of political sorting rather than simple population sorting.
Then, because I have those estimates, I realized I could probably map the results at the county level. To illustrate how this works, here’s a single-name example: Walker. In my last post I showed that “Walker” (among boy names) is among the more politically asymmetric names in the U.S. To see where those babies actually live according to our estimation model, here’s the map.

It’s sort of crazy. This is not a map of where actual “Walkers” were born in 2022, it’s as estimation of where babies given the name Walker were born. Walker is a perfect proof of concept: when the county-level estimates are mapped, an unmistakable pattern emerges. There are strong clusters of counties (many suburban and exurban, often in the South and Mountain West) where the name appears more frequently than we would expect based solely on population size.
Once that was in place, I basically applied the same logic to every name given to at least 200 babies in 2022, calculated its correlation with Trump’s 2020 state vote share, and identified those most positively and negatively associated with Republican vote. Below are the the top six Republican-leaning names.

What’s interesting about these names (Jase, Lakelynn, Malka, Marlee, Trenton, Whitley) is how similarly they are estimated to be distributed spatially: strong clusters across the South, Appalachia, and parts of the West, with relatively little concentrated presence in major urban centers. Even holding urbanicity constant, these names are disproportionately “red.” They show clear political clustering that can’t fully be explained by urban/rural demography alone.
So, then I did the same thing for the six most Democratic-leaning names given to more than 200 babies in 2022.

Here, Democratic-leaning names (e.g., Alina, Ethan, Luca, Maya, Mordechai, Raphael) show stronger concentrations in dense metro areas, especially on the coasts, the Southwest, the Upper Midwest, and parts of the West. And here, these patterns look more like population density, but they also show regionalized concentrations that go beyond a kind of “big cities have more babies” interpretation.
Still, the maps don’t yet tell the full story. What I really wanted to know is whether the strength of the political signal is symmetrical. Part of what struck me is the estimated numbers of babies given Republican versus Democratic names in each county. Note that the Democratic names are just a lot more common than the Republican names. Is that because the tail of that polarized naming culture is taller? Or is it because the parabola is narrower. Are Republican-leaning names just as strongly correlated with Republican vote share as Democratic-leaning names are with Democratic vote share? Or is one side culturally sorting more strongly than the other?
So I plotted the full density distributions of correlations for all names given to at least 200 babies in 2022. And this is actually really cool. It’s evidence that what I suggested initially regarding nominal polarization being more of a conservative trend than a liberal trend (HERE and HERE) is actually right.

This figure didn’t surprise me because I’d already expected this. This was just a new way of demonstrating what that actually looks like at the population level. The Republican side of the distribution is noticeably wider: there are more names with extremely strong positive correlations with Trump vote share than there are extremely anti-Trump names on the Democratic side. Democratic-leaning names cluster closer to the middle, with fewer outliers. In other words, the political imprint of Republican naming practices appears more polarized (measured this way anyway).
Finally, I broke those same correlations out by gender to see whether boys’ names or girls’ names contribute more to the effect. I did that because, in an earlier post (HERE), I suggested that nominal polarization seemed to impact boy names more than girl names. So, I wanted to see if the trend is gendered or not.

And here’s where it’s totally interesting. On the Republican side, boys’ names appear more polarized than girls’ names. But, on the Democratic side, the trend is reversed. There, girls’ names show somewhat stronger negative correlations than boys’. So, that suggests that among Republicans, political polarization impacts their naming of boys more than girls; and that, among Democrats, political polarization impacts their naming of girls more than boys. What??!?!?! Totally fascinating.
This helps me get a bit more around the ecological fallacy dilemma. I also love the method of estimation which allows county-level name data (just estimates of names not actual naming practices though). Not all political naming patterns are just reflections of population density. This suggests that there really are culturally and politically distinct naming practices, and those practices show different degrees of polarization across the political spectrum. Urban/rural sorting still matters. And it matters a lot. But it doesn’t explain everything. Some names carry political meaning independent of place.
I just think it’s so interesting that these patterns are embedded in this super intimate decision that parents make. Even before we know anything about these kids, their names (at scale) carry traces of the political worlds into which they were born.















