Boy Name · Irish Origin
Cillian
Last reviewed: June 2026
Considering Cillian? It is a boy name whose meaning is "Bright-headed", rooted in Irish naming tradition, and ranks in our Rare popularity tier. Phonetically it shares territory with Callahan, but stands on its own.
Names like Cillian
- Callahan — meaning, origin and popularity
- Callan — meaning, origin and popularity
- Colleen — meaning, origin and popularity
- Collin — meaning, origin and popularity
- Callen — meaning, origin and popularity
- Cullen — meaning, origin and popularity
- Coleman — meaning, origin and popularity
- Clemmie — meaning, origin and popularity
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Frequently asked about Cillian
What does the name Cillian mean?
Cillian means "Bright-headed" and is of Irish origin.
What is the origin of Cillian?
Cillian originates in Irish naming tradition. Names of Irish origin often share recognizable sounds and cultural roots that shape how the name reads today.
How do you pronounce Cillian?
Cillian has 7 letters and is most commonly stressed on the first syllable. Tap the pronunciation player on this page to hear it spoken aloud.
Is Cillian a boy's or girl's name?
Cillian is primarily used as a boy's name in US records, though usage can vary by region and era.
How popular is Cillian in 2026?
In our 2026 popularity tracker, Cillian sits in the Rare tier — an uncommon, standout choice.
What names are similar to Cillian?
Names that share Cillian's sound and style include Callahan, Callan, Colleen, Collin, Callen. Open the "Names like Cillian" rail on this page for the full list.