Boy Names Starting With K

28 US boy names beginning with K, each linking to scored middle, sibling and twin name pairings. Sorted A–Z; switch to popularity below.

How common are K names?

Boys names starting with K made up 5.12% of US boys' births recorded in 2025 (87,475 babies, roughly 1 in 20), close to the 4.18% it was in 1990.

Top K names by 2025 rank
NameRank in 2015Rank in 2025
Kai#145#93
Kayden#95#135
Knox#258#196
Kingston#142#204
Kevin#79#221

Kayce has risen furthest of the ranked names here, from #4,475 for US boys in 2015 to #375 in 2025.

On the middle-name pages, a middle name that also starts with K loses points. A doubled K in the initials is something some parents like and others avoid.

Boy Names starting with K

This page lists 28 boy names beginning with the letter K that are in real current use in the United States — including popular picks like Kai, Kayden, Knox. The count comes from US Social Security Administration public records: every name shown was given to at least a handful of US babies in the latest year, so this is not a list of invented or one-off spellings.

Open any name to see its pairing page — middle names, sibling names and twin names, each scored for how well it fits. Use the sort control above to switch between A–Z and 2025 popularity. To browse a different letter, go back to all boy names.