Boy · #507 in 2025

Cillian

Cillian: popularity and trends since 1880

Popularity, 1880–2025

per 100,000 boys born

Cillian per 100,000 boys born, by year. Peak: 2024. Gaps are years with fewer than five births, which SSA does not publish. Source: SSA, 1880–2025.

Cillian has been rising: its share of boys born has grown over the last 10 years. It now stands at 89% of its 2024 peak.

Names of the other sex that are about as common right now, so two siblings' names do not sound a generation apart.