Jack vs Oisín

Jack and Oisíncompared 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, Jack was ranked #2 and Oisín #5 among boys in Republic of Ireland.

Jack and Oisín over time

Jack and Oisín appear together in 1 published list, across 8 years of shared records. Jack held the stronger position in more years in 1 of them, Oisín in 0.

In none of those lists did their order change and stay changed.

Jack reached its own highest recorded position earlier in 1 of those lists, and Oisín 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.

List by list

Republic of Ireland · Boys8 shared years, 2018–2025
Jack held the stronger position in 8 of those years, Oisín in 0.
Highest recorded here: Jack #1 in 2018, Oisín #5 in 2023.
The order between them never changed and held in this list.
Most recent shared year, 2025: Jack #2, Oisín #5.

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 Jack

Pairs where Jack shares a published list with another name, each measured inside one registrar's own list.

Jack vs Oisin
Over 53 shared years in Republic of Ireland · Boys, Jack rose about as far as Oisin fell — from #305 and #163 in 1970 to #2 and #262 in 2025.
Jack · Oisin · 53 shared years, 1970–2025 · Mirrored each other
See the 2025 Republic of Ireland ranking
Jack vs Isaac
Jack and Isaac both rose over the same years in 4 registrars — New South Wales, Australia · Boys; New Zealand · Boys; Northern Ireland · Boys; Republic of Ireland · Boys. Each list is measured against its own starting position; the positions are never combined.
Jack · Isaac · 39 shared years, 1976–2025 · Moved together in several countries
Jack vs Max
Jack and Max both rose over the same years in 4 registrars — New South Wales, Australia · Boys; New Zealand · Boys; Northern Ireland · Boys; Republic of Ireland · Boys. Each list is measured against its own starting position; the positions are never combined.
Jack · Max · 41 shared years, 1973–2025 · Moved together in several countries
Jack vs Adam
Both reached their highest recorded position in England and Wales · Boys within 2 years — Jack #1 in 1996, Adam #16 in 1996.
Jack · Adam · 29 shared years, 1996–2024 · Peaked in the same years
See the 1996 England and Wales ranking

Side by side

Side-by-side comparison of Jack, Oisín
Field	Jack	Oisín
Record type	Editorially researched profile	Official statistical record (evidence-only)
Gender usage	male	male
Meaning	God is gracious (via John), though now used as an independent name.	Not yet recorded
Origin	English, historically a diminutive of John	Not yet recorded
Pronunciation	/ˈdʒæk/	Not yet recorded
Syllables	1	1
Common variants / nicknames	Jankin	Not yet recorded
Recorded regional usage	AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO, NZ	IE
Most recent popularity observation	Republic of Ireland · Boys #2 (2025)	Republic of Ireland · Boys #5 (2025)
Pronunciation clarity (demonstration score)	90/100	Not yet recorded
Spelling simplicity (demonstration score)	95/100	94/100
International familiarity (demonstration score)	100/100	40/100
Data Confidence	high	medium

What the data shows

Jack has a recorded origin (English, historically a diminutive of John); Oisín does not have one recorded yet.
Jack and Oisín both have 1 syllable.
A meaning is recorded for Jack; Oisín doesn't have one written yet.
Both names have recorded usage in IE.
The available evidence gives Jack a "high" Data Confidence level and Oisín a "medium" level — this reflects how complete and corroborated the underlying evidence is, not a judgement of either name.

How each name got here

Jack

Popularity journey

First recorded1945
First recorded at #171 among boys in Norway in 1945 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Norway · Boys
Highest recorded1996–2024
Highest recorded position: #1 among boys in England and Wales, in 1996 (recorded 1996–2024).
England and Wales · Boys
Most recent2025
Most recently recorded at #10 among boys in New South Wales, Australia, in 2025.
New South Wales, Australia · Boys

Oisín

Popularity journey

First recorded2018
First recorded at #15 among boys in Republic of Ireland in 2018 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Republic of Ireland · Boys
Highest recorded2018–2025
Highest recorded position: #5 among boys in Republic of Ireland, in 2023 (recorded 2018–2025).
Republic of Ireland · Boys
Most recent2025
Most recently recorded at #5 among boys in Republic of Ireland, in 2025.
Republic of Ireland · Boys