Will my child share the name Cillian with classmates?

Unlikely. With around 285 UK babies named Cillian per year, your child will almost certainly be the only Cillian in his class, and possibly the only one in the whole school.

Is Cillian becoming more or less popular in the UK?

Cillian is currently rising in popularity in the UK, up 61 places over the last five years to #177 in 2024. If this trend continues, it will become more common in classrooms over the next decade.

Is Cillian popular in the US as well as the UK?

Cillian is more popular in the UK (#177) than in the US (#463). Names with strong rankings in both countries tend to have broad cross-cultural appeal, working well for international families or those with ties to both nations.

Is Cillian a popular baby name in the United States?

Cillian appears in the US top 500 at #463 in 2024 — moderately popular in America, though less so than in the UK.

NameInClass Baby name predictor

👦 Boy's name 📊 Moderately Common UK #177

Cillian

Cillian sits comfortably in the UK charts at #177 in 2024 — recognisable but not overwhelming. Your child may occasionally share their name.

📊

UK Rank 2024

#177

US Rank #463

About the Name Cillian

Cillian is currently at its most popular point on record, sitting at UK #177. The name has climbed 61 places in the last five years — a significant surge by any measure. The name has been a consistent presence in UK records since 1996.

Cillian is distinctive enough that your child will likely be the only one in both their class and their school — standing out on every register.

In the US it sits at #463 — notably more popular in the UK than across the Atlantic.