Arwyn vs Cillian
Arwyn 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.
England and Wales · Boys
In 2025, Arwyn was ranked #1897 and Cillian #217 among boys in England and Wales.
Arwyn and Cillian over time
Arwyn and Cillian appear together in 1 published list, across 21 years of shared records. Cillian held the stronger position in more years in 1 of them, Arwyn in 0.
The order between them changed and held in one of those lists — a change in that published list, never a claim that one name displaced the other.
Arwyn reached its own highest recorded position earlier in 1 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.
- Peaked in the same years
Both reached their highest recorded position in England and Wales · Boys within 2 years — Arwyn #1420 in 2022, Cillian #177 in 2024.
List by list
England and Wales · Boys21 shared years, 1998–2025
Arwyn held the stronger position in 2 of those years, Cillian in 19.
Highest recorded here: Arwyn #1420 in 2022, Cillian #177 in 2024.
The order changed in 2001: Cillian moved ahead. In 2000 they stood at #2097 and #2943; by 2001 that had become #3134 and #1746.
Most recent shared year, 2025: Arwyn #1897, Cillian #217.
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.
Where to go next
Comparisons that share a name, a rule or a published list with this one. Each is an existing comparison page with its own evidence — nothing here says these pairs are alike.
Other comparisons involving Cillian
Pairs where Cillian shares a published list with another name, each measured inside one registrar's own list.
- Jason vs Cillian
Over 55 shared years in Republic of Ireland · Boys, Cillian rose about as far as Jason fell — from #53 and #305 in 1970 to #135 and #9 in 2025.
Jason · Cillian · 55 shared years, 1970–2025 · Mirrored each other
- Cillian vs Marcus
Over 55 shared years in Republic of Ireland · Boys, Cillian rose about as far as Marcus fell — from #305 and #111 in 1970 to #9 and #232 in 2025.
Cillian · Marcus · 55 shared years, 1970–2025 · Mirrored each other
- Cillian vs Nicholas
Over 55 shared years in Republic of Ireland · Boys, Cillian rose about as far as Nicholas fell — from #305 and #81 in 1970 to #9 and #198 in 2025.
Cillian · Nicholas · 55 shared years, 1970–2025 · Mirrored each other
- Cillian vs Ronan
Over 55 shared years in Republic of Ireland · Boys, Cillian rose about as far as Ronan fell — from #305 and #54 in 1970 to #9 and #86 in 2025.
Cillian · Ronan · 55 shared years, 1970–2025 · Mirrored each other
Side by side
| Field | Arwyn | Cillian |
|---|---|---|
| Record type | Official statistical record (evidence-only) | Editorially researched profile |
| Gender usage | Used for both boys and girls | male |
| Meaning | Not yet recorded | Probably from Old Irish 'cell' (church) combined with a diminutive suffix. |
| Origin | Not yet recorded | Irish |
| Pronunciation | Not yet recorded | Not yet recorded |
| Syllables | 2 | 2 |
| Common variants / nicknames | Not yet recorded | Not yet recorded |
| Recorded regional usage | GB-ENW, GB-SCT, IE | GB-ENW, GB-NIR, GB-SCT, IE |
| Most recent popularity observation | England and Wales · Boys #1897 (2025) | Republic of Ireland · Boys #9 (2025) |
| Pronunciation clarity (demonstration score) | Not yet recorded | 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
- Cillian has a recorded origin (Irish); Arwyn does not have one recorded yet.
- Arwyn and Cillian both have 2 syllables.
- A meaning is recorded for Cillian; Arwyn doesn't have one written yet.
- Both names have recorded usage in GB-ENW, GB-SCT, IE.
How each name got here
Arwyn
Popularity journey
First recorded1998
First recorded at #2419 among boys in England and Wales in 1998 — the earliest year that source publishes this name, not necessarily the earliest it was used.
England and Wales · Boys
Most recent2025
Most recently recorded at #3705 among girls in England and Wales, in 2025.
England and Wales · Girls
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 #217 among boys in England and Wales, in 2025.
England and Wales · Boys