Boy Names That Start With K

Ranked in the United States in 2025, with birth trends and peak years.

K is the 7th most common first initial for baby boys in the United States, with 15 K names in the top 300 for 2025, led by Kai (#93). Of those, Kohen is the fastest-growing, now 2.8 times as common as in 2020, while Koa saw the largest increase in births, with 805 more babies receiving the name than in 2020.