Two facts about American names look like they cannot both be true.
The first: we stopped sharing them. In 1880, the ten most popular boys' names covered 44% of all newborn boys, nearly half a country drawing from one short list. Today the top ten cover 8%. For girls the slide runs from 25% to 7%. The shared name, the name three kids in every classroom answered to, is gone.
The second fact contradicts the first. Even as we fled the popular names, we converged on a smaller set of sounds, especially for boys. The single most common ending letter for a boy's name accounted for about 15% of births for the whole first half of the 20th century. Then, starting in the 1960s, it climbed: by 2010 more than a third of all American boys got a name ending in the letter N: Aiden, Mason, Logan, Ethan, Jackson, Jaxon. Girls never moved off the vowel: about 37% have ended in a single dominant letter for 145 years, first the -E era (Annie, Carrie, Bessie), then the -A era (Linda, Lisa, Emma, Olivia).
So: fewer shared names, but fewer shared sounds. How can both be true at once?
The reconciliation: we respell
The answer is that American individuality stopped expressing itself through choice of name and started expressing itself through spelling. Parents take a sound everyone agrees on and write it a way no one else has. A 2010 nursery full of Jaydens, Aidens, Caydens, and Kaidens sounds identical at roll call and looks unique on every name tag. The originality is purely orthographic. You can watch it detonate, the same explosion caught at three different stages.
Caitlin is a complete supernova. Essentially nonexistent before the late 1970s, the sound KATE-lin splintered into Caitlin, Caitlyn, Katelyn, Kaitlyn, Katelynn, Katlyn and a dozen more, peaked at 17 spellings in 1998, and is now nearly extinct in all of them, an entire lifecycle inside one generation.
-aden barely existed before 1980. Then a sound that was effectively invented shattered into 81 distinct spellings by 2012: Jayden, Aiden, Brayden, out to Zaiden, Raiden, Khayden and Caedyn, more than 100,000 boys in a single year at its height. It is now collapsing: once a sound has eighty spellings, none of them feels special, and the whole family caves in.
-eigh is the one still running. And it works differently from the other two. Caitlin was one name; -aden was one sound; but -leigh is a productive suffix: a decorative ending you can bolt onto any root to mint a new daughter's name on demand. Everleigh. Oakleigh. Wrenleigh. Emberleigh. Novaleigh. Riverleigh. It has become a morpheme that means, roughly, a girl, bespoke. And the letters do no work at all: Ryleigh is Riley, Charleigh is Charley, Hayleigh is Hailey. The "-eigh" is four silent letters of pure decoration. Here is a single year of it. Every -eigh spelling given to at least 25 American girls in 2024, sized by how many:
What the supernova means
Put the three charts together and the paradox dissolves. American individualism did not invent new names, and it did not even invent new sounds. It took a shrinking set of shared sounds and fragmented them across the page: Caitlin seventeen ways, Aiden eighty-one, Riley into Ryleigh into anything-leigh without limit. We did not get more creative. We got more creative with the same few letters.
And the supernova is self-consuming. The instant a sound accumulates enough spellings, the distinctiveness each one was bought for evaporates, and parents move to the next frontier. Caitlin's generation has already burned out; -aden's is burning now; -eigh's is still bright. There will be another — there is always another — because the thing being chased was never a name. It was the feeling of being the only one.