Cillian
Cillian first appears in US records in 1995. It peaked in 2024, when 668 boys were given the name; in 2025 there were 595.
Source: US Social Security Administration.
Is Cillian popular?
Near its peak Cillian is more popular now than at almost any point on record, peaking in 2024.
| 2020s | 2,662 | |
|---|---|---|
| 2010s | 1,204 | |
| 2000s | 208 | |
| 1990s | 10 |
Counts from US Social Security Administration data, 1880–2025.
What does Cillian mean?
Cillian is linked to “bright-headed” and to cill, “church” or “monastery.”
Names like Cillian
Irish names with a similar feel and popularity.
Names that pair well with Cillian
Popular Irish names for a sibling or a middle name.
Compare Cillian
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Frequently asked questions
What does the name Cillian mean?
Cillian means Bright-headed; church. Cillian is linked to “bright-headed” and to cill, “church” or “monastery.”
What is the origin of the name Cillian?
Cillian is of Irish origin.
How do you pronounce Cillian?
Cillian is pronounced “KIL-ee-un.”
Is Cillian a boy or a girl name?
Cillian is most commonly used as a boy name.
Is Cillian a popular name right now?
Cillian is more popular now than at almost any point on record, peaking in 2024.
How popular is the name Cillian?
In 2025, Cillian ranked #507 among boys’ names in the United States, according to U.S. Social Security Administration data.
When was the name Cillian most popular?
Cillian was most popular in 2024, when about 668 US babies were given the name that year, according to US Social Security Administration records.
What names are similar to Cillian?
Names similar to Cillian include Doyle, Kian, Kieran, Sullivan, Cian.
What names go well with Cillian?
Irish names that pair well with Cillian include Ryan, Liam, Aiden, Sean, Aidan.