Killian is a boy name family recorded 144,085 times in 18 countries since 1915. It ranks highest today in Ireland (#9 in 2025). Its all-time peak was in Northern Ireland in 2024, at 1,038.5 births per 100,000. Elsewhere it is mostly given as Kylian (France, Belgium), Cillian (Ireland, England & Wales, Northern Ireland), Kilian (Austria, Switzerland).
Popularity by country
Births per 100,000 newborns, all forms of the name combined.
Which form wins where
Births per 100,000 newborns for each form, in the selected country.
All forms of Killian
| Variants | Language | Total births | Country | Latest rank | Peak year | 10-year trend |
|---|---|---|---|---|---|---|
| Killian | English | 21,960 | 🇫🇷 France | #3794 | 2002 | ▼ 96 % |
| Killian | English | 16,834 | 🇺🇸 United States | #417 | 2017 | ▼ 12 % |
| Killian | English | 3,767 | 🇮🇪 Ireland | #141 | 2001 | ▼ 30 % |
| Killian | English | 970 | 🇧🇪 Belgium | #1350 | 2002 | ▼ 66 % |
| Killian | English | 877 | 🏴 England & Wales | #627 | 2022 | ▲ 202 % |
| Killian | English | 267 | 🇨🇦 Ontario | #412 | 2019 | ▲ 236 % |
| Kylian | French | 31,085 | 🇫🇷 France | #303 | 2007 | ▼ 77 % |
| Kylian | French | 3,750 | 🇺🇸 United States | #622 | 2023 | ▲ 4,122 % |
| Kylian | French | 2,167 | 🇧🇪 Belgium | #500 | 2005 | ▼ 56 % |
| Kylian | French | 759 | 🇨🇭 Switzerland | #577 | 2019 | ▼ 33 % |
| Kylian | French | 418 | 🇨🇦 Québec | #170 | 2024 | ▲ 359 % |
| Kylian | French | 399 | 🏴 England & Wales | #679 | 2023 | – |
| Kilian | German | 10,745 | 🇫🇷 France | #2605 | 2005 | ▼ 90 % |
| Kilian | German | 4,591 | 🇦🇹 Austria | #56 | 2004 | ▼ 11 % |
| Kilian | German | 2,717 | 🇺🇸 United States | #1166 | 2023 | ▲ 50 % |
| Kilian | German | 2,310 | 🇨🇭 Switzerland | #105 | 2011 | ▼ 25 % |
| Kilian | German | 1,449 | 🇪🇸 Catalonia | #225 | 2016 | ▼ 70 % |
| Kilian | German | 910 | 🇩🇪 Germany (large cities) | #85 | 2025 | – |
| Cillian | English | 8,356 | 🇮🇪 Ireland | #9 | 2024 | ▲ 25 % |
| Cillian | English | 4,090 | 🇺🇸 United States | #507 | 2024 | ▲ 449 % |
| Cillian | English | 2,522 | 🏴 England & Wales | #217 | 2024 | ▲ 171 % |
| Cillian | English | 1,690 | 🇬🇧 Northern Ireland | #11 | 2024 | ▲ 49 % |
| Cillian | English | 495 | 🏴 Scotland | #100 | 2024 | ▲ 218 % |
| Cillian | English | 295 | 🇫🇷 France | #2059 | 2023 | ▲ 88 % |
| Kyllian | French | 9,110 | 🇫🇷 France | #4737 | 2003 | ▼ 96 % |
| Kyllian | French | 586 | 🇧🇪 Belgium | – | 2005 | – |
| Kyllian | French | 318 | 🇺🇸 United States | #4707 | 2023 | ▲ 29 % |
| Kyllian | French | 39 | 🇨🇭 Switzerland | – | 2007 | – |
| Kyllian | French | 12 | 🏴 England & Wales | – | 2024 | – |
| Kyllian | French | 10 | 🇨🇦 Québec | #697 | 2025 | – |
| Kilyan | French | 2,575 | 🇫🇷 France | #2721 | 2009 | ▼ 83 % |
| Kilyan | French | 99 | 🇺🇸 United States | #6803 | 2024 | ▲ 157 % |
| Kilyan | French | 67 | 🇧🇪 Belgium | – | 2005 | – |
| Kyliann | French | 1,610 | 🇫🇷 France | #6620 | 2007 | ▼ 87 % |
| Kyliann | French | 15 | 🇺🇸 United States | – | 2023 | – |
| Kyliann | French | 5 | 🇧🇪 Belgium | – | 2005 | – |
| Killyan | French | 1,140 | 🇫🇷 France | #5441 | 2005 | ▼ 79 % |
| Killyan | French | 26 | 🇧🇪 Belgium | – | 2005 | – |
| Killyan | French | 11 | 🇺🇸 United States | – | 2023 | – |
| Kilyann | French | 400 | 🇫🇷 France | – | 2007 | – |
| Cylian | French | 350 | 🇫🇷 France | #2935 | 2009 | ▼ 37 % |
| Kiliann | French | 315 | 🇫🇷 France | – | 2004 | – |
How we grouped these names
- Killian ↔ Kylian — spelling variant
- Killian ↔ Kilian — spelling variant
- Killian ↔ Cillian — spelling variant
- Killian ↔ Kyllian — spelling variant
- Killian ↔ Kilyan — spelling variant
- Killian ↔ Kyliann — spelling variant
- Killian ↔ Killyan — spelling variant
- Killian ↔ Kilyann — spelling variant
- Killian ↔ Cylian — spelling variant
- Killian ↔ Kiliann — spelling variant
Questions about Killian
How popular is the name Killian?
In 2025 it ranked #9 in Ireland. Official registers record 144,085 births across 18 countries.
What is Killian in other languages?
Kylian (French); Kilian (German); Cillian (English); Kyllian (French); Kilyan (French); Kyliann (French); Killyan (French); Kilyann (French); Cylian (French); Kiliann (French).
When was Killian most popular?
It peaked in Northern Ireland in 2024, at 1,038.5 births per 100,000.
Is Killian a boy or a girl name?
In official birth registers, Killian is a boy name.