THE NAME REPORT · FIRST-NAME VIEW
Cillian
KIL-ee-an
MEANING
church
NAME PROFILE
Pronunciation & Spelling
Learnable with light exposure
Most of the uncertainty is in the first pronunciation, not the act of writing the name. The same spelling can suggest more than one credible reading.
73/100
Everyday Use
Low risk
The main everyday ambiguity is name-to-name confusion: listeners can reasonably hear a nearby familiar name instead.
94/100
Lifetime Fit
Strong lifetime fit
The main lifetime trade-off is generational concentration. The name is more strongly associated with one age band than with the full age spectrum.
79/100
International Mobility
Travels well, with one adaptation
Cross-market pronunciation is the main trade-off: the spelling stays recognizable, but the first reading can shift with local language rules.
89/100
NAME DETAILS
- IN OTHER LANGUAGES
- Cillín (Irish)
- Kilian (German, Spanish)
- Killian (English, French)
- Kylian, Kyllian (French)
- Lian (German, informal)
About the name
Meaning
church.
Origin and history
Cillian (Irish). Old Irish.
Mythological and religious context
Associated with a 7th-century Irish Christian saint and missionary (Saint Kilian), venerated particularly in Würzburg, Germany, where he was martyred.
Style through life
Reads as classic, formal, and refined in adult professional contexts per user-perception data, helped in recent years by high-profile association with Academy Award-winning actor Cillian Murphy; non-Irish speakers in the US may need to learn the pronunciation. Phonetically approachable for a child once the initial "K" sound of the "Ci-" spelling is learned, though English-speaking teachers and peers unfamiliar with Irish orthography may initially misread the spelling as starting with a soft "S" or "Ch" sound. Functions as a complete formal given name with no standard shortened nickname documented in the sources consulted.
Regional and cultural use
A strongly Irish name, currently very popular in Ireland and Northern Ireland (top-10 and top-15 respectively in 2025), with more modest but real usage in the US, England & Wales, and Scotland; Irish/Anglophone crossover use has grown alongside actor Cillian Murphy's international profile.
CULTURAL REFERENCES
Cillian Murphy, Academy Award-winning Irish actor
Oppenheimer, Peaky Blinders
Worth knowing
Commonly mispronounced as SIL-ee-an.
Bottom line
Cillian is workable on its own, with one trade-off worth testing before you settle on it. First impressions matter here — show the spelling to someone new and listen for their first guess at the pronunciation.
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