Boy names that start with K

1,329 different boy names starting with K were given to five or more US boys in 2025, 87,475 babies in all, or 5.1% of recorded boys.

The most common was Kai, with 3,768 boys (#93 overall), followed by Kayden, Knox and Kingston. The table lists the top 100 by 2025 births, with each name’s change in national rank since 2024.

Since 2024, 42 of the 100 ranked names listed here moved up the national boy ranking and 58 moved down. The biggest climb was Kasai, from #1,747 to #639.

1 of the names listed is in the national top 100 for boys in 2025, and 74 are in the top 1,000. They run from 3 letters (Kai) to 10 (Kristopher).

Only names where at least 10% of 2025 births were boys are included, so a name mostly given to the other sex is left out. Sparklines run from 1880 to 2025.