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The short answer
Killian is a masculine name used in Irish and French. Behind the Name describes it this way: "Anglicized form of Cillian, also used in France." It ranked #418 for boys in the United States in 2025.
Meaning and etymology
According to Behind the Name, anglicized form of Cillian, also used in France. The entry lists its usage as Irish, French.
Editorial confidence: likely
Popularity
Killian ranked #418 for boys in the United States in 2025. The figure comes from the Social Security Administration's national file for that year.
| Region | Year | Rank | Source |
|---|---|---|---|
| United States | 2025 | #418 | ssa-2025 |
If you like this name
Names that Behind the Name files under the same origin (Irish) and that sit near Killian in the 2025 American rankings.
Similar by origin
Frequently asked questions
What does the name Killian mean?
Behind the Name does not give Killian a one-word meaning. It describes the name as follows: anglicized form of Cillian, also used in France.
Is Killian a popular name?
Killian ranked #418 for boys in the United States in 2025. (Social Security Administration data).
Is Killian a boy's or a girl's name?
In the 2025 SSA data Killian appears in the boys' list; Behind the Name labels it masculine.
Sources
- Behind the Name: Meaning, origin and history of the name Killian — supports meaning, usage, pronunciation, variants.
- U.S. Social Security Administration: Popular Baby Names — national data, year of birth 2025 — supports popularity.
