Killua is a very rare boys' name that peaked in 2023 and remains in steady use.
Killua is a boy name. In 2025 it ranked #6,292 for boy births in the United States (and #13,232 across all names), given to 14 babies. Killua first appears in 2019 and peaked in 2023 (27 births).
Boys named Killua per year · hover for count and boys rank · Source: U.S. Social Security Administration, national data 2019–2025 · U.S.+territories from SSA territory files (1998–2025)