Fionn vs Oisin
Fionn and Oisincompared 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.
Republic of Ireland · Boys
In 2025, Fionn was ranked #6 and Oisin #262 among boys in Republic of Ireland.
Northern Ireland · Boys
In 2024, Fionn was ranked #26 and Oisin #9 among boys in Northern Ireland.
Scotland · Boys
In 2024, Fionn was ranked #330 and Oisin #234 among boys in Scotland.
England and Wales · Boys
In 2025, Fionn was ranked #658 and Oisin #517 among boys in England and Wales.
Fionn and Oisin over time
Fionn and Oisin appear together in 3 published lists, across 107 years of shared records. Oisin held the stronger position in more years in 3 of them, Fionn 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.
Oisin reached its own highest recorded position earlier in 3 of those lists, and Fionn 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, Fionn moved into the top 50 at #14 in 2018 as Oisin fell out of it to #247, having been #11 the year before.
- One moved ahead of the other
In 2018, Fionn moved ahead of Oisin in Republic of Ireland · Boys — #14 and #11 the year before became #14 and #247.
- Repeatedly exchanged positions
Fionn and Oisin changed places 8 times in England and Wales · Boys between 1996 and 2025, ending at #658 and #517.
- Mirrored each other
Over 51 shared years in Republic of Ireland · Boys, Fionn rose about as far as Oisin fell — from #257 and #164 in 1971 to #6 and #262 in 2025.
- Longest-running competitions
Fionn and Oisin were both ranked in England and Wales · Boys for 30 years, from 1996 to 2025, ending at #658 and #517.
- Peaked in the same years
Both reached their highest recorded position in England and Wales · Boys within 2 years — Fionn #555 in 2022, Oisin #433 in 2021.
List by list
Republic of Ireland · Boys51 shared years, 1971–2025
Fionn held the stronger position in 8 of those years, Oisin in 43.
Highest recorded here: Fionn #6 in 2023, Oisin #8 in 2016.
The order changed in 2018: Fionn moved ahead. In 2017 they stood at #14 and #11; by 2018 that had become #14 and #247.
Most recent shared year, 2025: Fionn #6, Oisin #262.
England and Wales · Boys30 shared years, 1996–2025
Fionn held the stronger position in 4 of those years, Oisin in 26.
Highest recorded here: Fionn #555 in 2022, Oisin #433 in 2021.
The order between them never changed and held in this list.
Most recent shared year, 2025: Fionn #658, Oisin #517.
Northern Ireland · Boys26 shared years, 1999–2024
Fionn held the stronger position in 0 of those years, Oisin in 26.
Highest recorded here: Fionn #26 in 2024, Oisin #7 in 2022.
The order between them never changed and held in this list.
Most recent shared year, 2024: Fionn #26, Oisin #9.
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 | Fionn | Oisin |
|---|---|---|
| Record type | Editorially researched profile | Editorially researched profile |
| Gender usage | male | male |
| Meaning | Traditionally interpreted as 'white' or 'fair', extending in Old Irish usage to 'bright' and figuratively 'true, just'. Strongly associated with the mythological hero Fionn mac Cumhaill. | Traditionally interpreted as 'little deer', combining an Old Irish word for deer or stag with a diminutive ending. |
| Origin | Irish | Irish |
| Pronunciation | /ˈfɪn/ | /oʊˈʃiːn/ |
| Syllables | 1 | 2 |
| Common variants / nicknames | Not yet recorded | Not yet recorded |
| Recorded regional usage | GB-ENW, GB-NIR, GB-SCT, IE | GB-ENW, GB-NIR, GB-SCT, IE |
| Most recent popularity observation | Republic of Ireland · Boys #6 (2025) | Republic of Ireland · Boys #262 (2025) |
| Pronunciation clarity (demonstration score) | 90/100 | 90/100 |
| Spelling simplicity (demonstration score) | 94/100 | 94/100 |
| International familiarity (demonstration score) | 100/100 | 100/100 |
| Data Confidence | medium | medium |
What the data shows
- Both Fionn and Oisin share a recorded Irish origin.
- Fionn has 1 syllable, compared with 2 for Oisin.
- Fionn's recorded meaning differs from Oisin'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
Fionn
Popularity journey
First recorded1971
First recorded at #257 among boys in Republic of Ireland in 1971 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Republic of Ireland · Boys
Highest recorded1971–2025
Highest recorded position: #6 among boys in Republic of Ireland, in 2023 (recorded 1971–2025).
Republic of Ireland · Boys
Most recent2025
Most recently recorded at #658 among boys in England and Wales, in 2025.
England and Wales · Boys
Oisin
Popularity journey
First recorded1964
First recorded at #232 among boys in Republic of Ireland in 1964 — 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: #7 among boys in Northern Ireland, in 2022 (recorded 1997–2024).
Northern Ireland · Boys
Most recent2025
Most recently recorded at #517 among boys in England and Wales, in 2025.
England and Wales · Boys