Cillian
Featured in baby name books
Cillian is Irish and connected with war or conflict, with Killian as a common spelling. The name is tied to cill, the Irish word for “church,” and is borne by St. Kilian, a seventh-century Cavan-born missionary martyred in Würzburg. Actor Cillian Murphy gave up a record deal to pursue the stage and went on to Hollywood success.
Sources: 10,000 Baby Names, Baby Names (Laura Emerson), Irish Names for Children, Badass Baby Names
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Usage of Cillian in different languages / cultures
The list below was created by gathering names from various sources for different languages, and then matching Cillian against each list of names.
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Albanian
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Arabic
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Armenian
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Bengali
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Bulgarian
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Catalan
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Chinese
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Cornish
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Croatian
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Czech
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Danish
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Dothraki
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Dutch
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English
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Estonian
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Filipino
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Finnish
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French
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Georgian
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German
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Greek
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Hawaiian
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Hebrew
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Hindi
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Hungarian
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Icelandic
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Indonesian
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Irish
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Italian
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Japanese
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Khmer
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Klingon
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Korean
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Latin
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Latvian
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Lithuanian
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Macedonian
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Norwegian
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Persian
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Polish
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Portuguese
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Romanian
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Russian
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Scottish
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Serbian
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Slovak
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Slovenian
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Spanish
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Swedish
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Telugu
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Thai
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Turkish
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Ukrainian
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Vietnamese
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Welsh
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Yiddish
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Yoruba
Note: In some cases it is possible for the check mark to be missing even if Cillian is used in a particular country, as almost no source name list has 100% coverage.
Cillian in official name statistics
United States
In 2025, 595 boys were named Cillian, making it the #507 boys' name in the US. Since 1995, 4,084 boys have been named Cillian, with the most (668) in 2024. It is most common, relative to births, in Alaska, Delaware and Rhode Island.
Source: Social Security Administration baby name data, 1880–2025. Names given to fewer than 5 babies in a year are not listed.
Other countries
| Where | Rank | Count | Source |
|---|---|---|---|
| Canada (Ontario) | #397 boys | 32 | Government of Ontario (Office of the Registrar General, ServiceOntario), 2024 |
| Canada (Quebec) | #623 boys | 6 | Retraite Québec (via Données Québec), 2025 |
| England and Wales | #217 boys | 230 | Office for National Statistics (ONS), 2025 |
| Ireland | #9 boys | 271 | Central Statistics Office (CSO), 2025 |
| New Zealand | #297 boys | 15 | Department of Internal Affairs (DIA), Births, Deaths and Marriages, 2025 |
| Northern Ireland (English-speaking) | #11 boys | 95 | Northern Ireland Statistics and Research Agency (NISRA), 2025 |
| Northern Ireland (Irish-speaking) | #11 boys | 95 | Northern Ireland Statistics and Research Agency (NISRA), 2025 |
| Scotland | #100 boys | 51 | National Records of Scotland (NRS), 2025 |
| Sweden | #559 boys | 9 | Swedish Tax Agency (Skatteverket), 2025 |
Counts are babies born that year, or living people for "all ages" rows, as published by each country's statistics office or population register.
Towns named Cillian
There are 1 towns and villages with Cillian in their name.
| Name | Where | Population | |
|---|---|---|---|
| Cillian | Aosta Valley, 🇮🇹 Italy | 102 | Map |
Source: GeoNames (CC BY 4.0). Maps: OpenStreetMap.
Celebrities named Cillian
Based on celebrities listed on Wikipedia, filtered to only those with the first name Cillian.
Cillian Murphy
Cillian Sheridan
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