Cillian

At a Glance: Name: Cillian – Meaning: of disputed origin: possibly 'strife/war' or 'church' (Old Irish ceallach/ceall), or separately from Latin Caecilianus – Origin: Irish (contested) – Gender: Boy – Pronunciation: KIL-ee-an

---

Cillian is a boy's name from Ireland, pronounced KIL-ee-an, and its meaning is genuinely disputed rather than settled — it's traced to Old Irish roots pointing to 'strife/war' or 'church,' with some scholars linking it instead to the Latin Caecilianus. You may spot it defined elsewhere as meaning 'bright-headed,' but that's an unsupported gloss with no real source behind it. Cillian is a modern pick with a worldly, bold feel.

Meaning & Origin of Cillian

Meaning: Of disputed origin: possibly 'strife/war' or 'church' (old irish ceallach/ceall), or separately from latin caecilianus.

Origin: Irish (contested).

A common claim: Cillian is frequently glossed on baby-name sites as meaning 'bright-headed.' Actually: Cillian's origin is genuinely disputed: it may come from Old Irish words for 'strife/war' or 'church,' or separately from the Latin name Caecilianus. There's no support for a 'bright-headed' meaning.

Source: Wiktionary.

How to Pronounce Cillian

Phonetic: KIL-ee-an   IPA: /ˈkɪliən/

Popularity of Cillian

SSA records from 1995 to 2024 show Cillian reaching its highest-ever rank of #463 in 2024, with 668 babies given the name that year — both its most recent and its peak showing in the same year.

Source: U.S. Social Security Administration birth-name data, 1995–2024.

Make Cillian Name Art

Free printable nursery art for Cillian, pre-loaded below — pick a layout, palette, and font, then download a print-ready PNG.

Names With a Similar Story

Derived from shared style, era, and origin data (or, for names we have no style data for, a similar Social Security popularity trajectory) — not a hand-picked list.

• Killian
• Callan
• Carrick
• Cashel
• Aidan
• Ardal

FAQ

What does the name Cillian mean?

Of disputed origin: possibly ‘strife/war’ or ‘church’ (old irish ceallach/ceall), or separately from latin caecilianus. (Source: Wiktionary, https://en.wiktionary.org/wiki/Cillian)

How do you pronounce Cillian?

Cillian is pronounced KIL-ee-an (IPA: /ˈkɪliən/).

Is Cillian a popular name right now?

Cillian is at its highest recorded popularity right now, ranked #463 in 2024. (U.S. Social Security Administration data, 1995–2024.)

More Baby Name Inspiration

• Check any name’s popularity history
• Take the naming-style quiz
• Make art for a different name