Killua has been given to about 118 people in the United States since 1880. It was most common in 2023, which makes it a current name.
Its best year was 2023, when 27 babies were given the name, ranking 4075th. The typical living American called Killua is about 4 years old today.
Source: US Social Security Administration, national and state name files, 2025 release. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.