Cillian is a boy name with a modern feel, drawn from real birth records.
| Country | Births on record |
|---|---|
| United States since 1880 | 4,090 births |
| England & Wales since 1996 | 2,368 births |
| Ireland since 1964 | 8,347 births |
Counts come from national birth registrations: the U.S. Social Security Administration, England & Wales (ONS) and Ireland (CSO). Coverage spans differ, so totals aren't directly comparable across countries.
Babies named Cillian per year — United States (1995–2025). United States peaked in 2024 (674/yr) · Ireland peaked in 2007 (377/yr) · England & Wales peaked in 2024 (285/yr).
Cillian reached its peak in 2024, when it was the #939 most popular baby name in the United States — making it a quintessential 2020s name.
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