Cillian
Cillian Name Meaning, Origin & Popularity
KIL-ee-an
Meaning of Cillian: The name Cillian derives from Old Irish Cellach, believed to come from the root ceall meaning "church" or "monastic cell." The name is closely tied to Saint Cillian of Wurzburg, a 7th-century Irish missionary martyred in Bavaria around 689 CE, whose feast day falls on July 8.
Saint Cillian traveled from Ireland to Franconia as part of the broader Hiberno-Scottish mission, bringing Christianity to Germanic territories. His martyrdom elevated the name to hagiographic status, ensuring its survival through medieval Irish ecclesiastical records and later popular devotion.
In Ireland, Cillian has charted in the national top 10 for boys throughout the 2010s and 2020s, reflecting a broader Irish revival of traditional Gaelic names. The name ranks consistently high in counties Limerick, Clare, and Tipperary, areas with deep roots in early Irish monasticism.
What Does Cillian Mean? Origin & Etymology
According to SSA records, Cillian ranked #463 for boys in the US as of 2024, with 668 births recorded that year. The peak in 2024 coincides with rising international interest following actor Cillian Murphy's Academy Award win for Oppenheimer.
The name is pronounced "KIL-ee-an" in Irish. English speakers sometimes adopt the spelling Killian, which shares the same etymology and saint but follows anglicized phonetics more closely.
How Popular Is Cillian?
Numerology & Symbolism of Cillian
Based on Pythagorean numerology — a traditional system linking name letters to numbers. Presented for cultural interest.
Cillian – Similar Names & Alternatives
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Frequently Asked Questions about Cillian
What does the name Cillian mean?
The name Cillian originates in Old Irish Gaelic. Irish names frequently reference natural elements—rivers, landscapes, animals—or carry meanings tied to early Celtic mythology and the warrior tradition of early Irish literature.
How popular is the name Cillian in the United States?
According to SSA records, Cillian ranked #463 for boy names in the United States, with 668 births recorded in the most recent annual count. The name hit its highest SSA rank in 2024. It has held a consistent place in US naming statistics across multiple decades.
Where does the name Cillian come from?
The name Cillian comes from Irish. It entered English use through the linguistic and cultural channels typical of Irish-origin names—whether through religious texts, migration, or the prestige associated with classical learning. Today it is recognized as a boy’s name across the English-speaking world.