Brian vs Cillian
Brian and Cilliancompared on official birth-registration statistics and Namewise's recorded data. This page states what each name's record shows — it never picks a winner or scores one name against the other.
Head to head
Ranks are only compared within one published list and one year. Two ranks from different years, from a boys' and a girls' list, or from different registrars are not comparable, so they are not placed side by side.
Northern Ireland · Boys
In 2024, Brian was ranked #256 and Cillian #2 among boys in Northern Ireland.
Republic of Ireland · Boys
In 2025, Brian was ranked #252 and Cillian #9 among boys in Republic of Ireland.
Scotland · Boys
In 2024, Brian was ranked #535 and Cillian #83 among boys in Scotland.
England and Wales · Boys
In 2024, Brian was ranked #538 and Cillian #177 among boys in England and Wales.
Brian and Cillian over time
Brian and Cillian appear together in 3 published lists, across 111 years of shared records. Brian held the stronger position in more years in 2 of them, Cillian in 1.
The order between them changed and held in 3 of those lists — a change in that published list, never a claim that one name displaced the other.
Brian reached its own highest recorded position earlier in 3 of those lists, and Cillian in none. Each position is a place inside its own list, so this compares when they peaked and never how high.
Counted list by list. Two names in the same published list are measured on the same scale in the same year, so those comparisons are real — but positions from different lists are not, so nothing here is combined into an overall standing.
How this pair is related
The relationship kinds these two qualify for, each under its own stated rule. Every one is drawn from a list they both appear in.
- One took the other's place near the top
In Republic of Ireland · Boys, Cillian moved into the top 50 at #28 in 2006 as Brian fell out of it to #52, having been #43 the year before.
- One moved ahead of the other
In 2006, Cillian moved ahead of Brian in Northern Ireland · Boys — #109 and #178 the year before became #180 and #110.
- Mirrored each other
Over 29 shared years in England and Wales · Boys, Cillian rose about as far as Brian fell — from #251 and #1104 in 1996 to #538 and #177 in 2024.
- Longest-running competitions
Brian and Cillian were both ranked in Republic of Ireland · Boys for 55 years, from 1970 to 2025, ending at #252 and #9.
List by list
Republic of Ireland · Boys55 shared years, 1970–2025
Brian held the stronger position in 34 of those years, Cillian in 21.
Highest recorded here: Brian #7 in 1977, Cillian #4 in 2024.
The order changed in 2006: Cillian moved ahead. In 2005 they stood at #43 and #45; by 2006 that had become #52 and #28.
Most recent shared year, 2025: Brian #252, Cillian #9.
England and Wales · Boys29 shared years, 1996–2024
Brian held the stronger position in 20 of those years, Cillian in 9.
Highest recorded here: Brian #251 in 1996, Cillian #177 in 2024.
The order changed in 2016: Cillian moved ahead. In 2015 they stood at #383 and #404; by 2016 that had become #406 and #380.
Most recent shared year, 2024: Brian #538, Cillian #177.
Northern Ireland · Boys27 shared years, 1997–2024
Brian held the stronger position in 9 of those years, Cillian in 18.
Highest recorded here: Brian #75 in 1997, Cillian #2 in 2024.
The order changed in 2006: Cillian moved ahead. In 2005 they stood at #109 and #178; by 2006 that had become #180 and #110.
Most recent shared year, 2024: Brian #256, Cillian #2.
Two names moving past each other in a ranking is a fact about the ranking. Namewise does not claim one name displaced the other, that families chose between them, or that either influenced the other — none of that is in this data.
Side by side
| Field | Brian | Cillian |
|---|---|---|
| Record type | Editorially researched profile | Editorially researched profile |
| Gender usage | male | male |
| Meaning | The meaning is explicitly uncertain; possibly connected to Celtic concepts of 'high, hill' or 'might, power' — no single settled meaning. | Probably from Old Irish 'cell' (church) combined with a diminutive suffix. |
| Origin | Old Irish / Celtic | Irish |
| Pronunciation | /ˈbraɪən/ | Not yet recorded |
| Syllables | 1 | 2 |
| Common variants / nicknames | Not yet recorded | Not yet recorded |
| Recorded regional usage | AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO, NZ | GB-ENW, GB-NIR, GB-SCT, IE |
| Most recent popularity observation | Republic of Ireland · Boys #252 (2025) | Republic of Ireland · Boys #9 (2025) |
| Pronunciation clarity (demonstration score) | 90/100 | Not yet recorded |
| Spelling simplicity (demonstration score) | 94/100 | 82/100 |
| International familiarity (demonstration score) | 100/100 | 100/100 |
| Data Confidence | medium | medium |
What the data shows
- Brian is recorded with a Old Irish / Celtic origin, while Cillian is recorded with a Irish origin.
- Brian has 1 syllable, compared with 2 for Cillian.
- Brian's recorded meaning differs from Cillian's — see the table above for each.
- Both names have recorded usage in GB-ENW, GB-NIR, GB-SCT, IE.
How each name got here
Brian
Popularity journey
First recorded1945
First recorded at #296 among boys in Norway in 1945 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Norway · Boys
Highest recorded1964–2025
Highest recorded position: #7 among boys in Republic of Ireland, in 1977 (recorded 1964–2025).
Republic of Ireland · Boys
Most recent2025
Most recently recorded at #372 among boys in Norway, in 2025.
Norway · Boys
Cillian
Popularity journey
First recorded1970
First recorded at #305 among boys in Republic of Ireland in 1970 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Republic of Ireland · Boys
Highest recorded1997–2024
Highest recorded position: #2 among boys in Northern Ireland, in 2024 (recorded 1997–2024).
Northern Ireland · Boys
Most recent2025
Most recently recorded at #9 among boys in Republic of Ireland, in 2025.
Republic of Ireland · Boys