Namewise

Ciaran vs Jack

Ciaran and Jackcompared 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, Ciaran was ranked #372 and Jack #2 among boys in Republic of Ireland.

  • Northern Ireland · Boys

    In 2024, Ciaran was ranked #216 and Jack #4 among boys in Northern Ireland.

  • Scotland · Boys

    In 2024, Ciaran was ranked #191 and Jack #7 among boys in Scotland.

  • England and Wales · Boys

    In 2025, Ciaran was ranked #953 and Jack #24 among boys in England and Wales.

Ciaran and Jack over time

Ciaran and Jack appear together in 3 published lists, across 110 years of shared records. Jack held the stronger position in more years in 3 of them, Ciaran 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.

Each reached its own highest recorded position first in 1 of the lists they share.

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 moved ahead of the other

    In 1995, Jack moved ahead of Ciaran in Republic of Ireland · Boys — #29 and #33 the year before became #27 and #19.

  • Longest-running competitions

    Ciaran and Jack were both ranked in England and Wales · Boys for 30 years, from 1996 to 2025, ending at #953 and #24.

  • Peaked in the same years

    Both reached their highest recorded position in Republic of Ireland · Boys within 2 years — Ciaran #23 in 2000, Jack #1 in 2000.

List by list

  • Republic of Ireland · Boys52 shared years, 1970–2025

    Ciaran held the stronger position in 22 of those years, Jack in 30.

    Highest recorded here: Ciaran #23 in 2000, Jack #1 in 2000.

    The order changed in 1995: Jack moved ahead. In 1994 they stood at #29 and #33; by 1995 that had become #27 and #19.

    Most recent shared year, 2025: Ciaran #372, Jack #2.

  • England and Wales · Boys30 shared years, 1996–2025

    Ciaran held the stronger position in 0 of those years, Jack in 30.

    Highest recorded here: Ciaran #107 in 2004, Jack #1 in 1996.

    The order between them never changed and held in this list.

    Most recent shared year, 2025: Ciaran #953, Jack #24.

  • Northern Ireland · Boys28 shared years, 1997–2024

    Ciaran held the stronger position in 0 of those years, Jack in 28.

    Highest recorded here: Ciaran #26 in 1998, Jack #1 in 2001.

    The order between them never changed and held in this list.

    Most recent shared year, 2024: Ciaran #216, Jack #4.

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 Ciaran

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

Other comparisons involving Jack

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

Other pairs with the same kind of relationship

Pairs that qualify under the same rule as this one — peaked in the same years.

All peaked in the same years→

Other pairs from Republic of Ireland lists

Pairs measured inside Republic of Ireland's own published lists, where this pair's strongest relationship is also recorded. Positions in these lists are not comparable with another registrar's.

Republic of Ireland overview→

Other pairs ranked together in the 2020s

Pairs both ranked in the same published list at some point between 2020 and 2029.

The 2020s across all registrars→

Side by side

Side-by-side comparison of Ciaran, Jack
FieldCiaranJack
Record typeEditorially researched profileEditorially researched profile
Gender usagemalemale
MeaningThe unaccented catalogue spelling of Ciarán, a diminutive of Ciar ('black, dark') — borne by two 6th-century Irish saints, Ciarán the Elder (founder of Saighir) and Ciarán the Younger (founder of Clonmacnoise).God is gracious (via John), though now used as an independent name.
OriginIrish, from Old Irish ciar ('dark')English, historically a diminutive of John
Pronunciation/ˈciə.ɾˠaːnˠ//ˈdʒæk/
Syllables21
Common variants / nicknamesCiarán, Kieran, Kieron, KyranJankin
Recorded regional usageGB-ENW, GB-NIR, GB-SCT, IEAU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO, NZ
Most recent popularity observationRepublic of Ireland · Boys #372 (2025)Republic of Ireland · Boys #2 (2025)
Pronunciation clarity (demonstration score)90/10090/100
Spelling simplicity (demonstration score)88/10095/100
International familiarity (demonstration score)100/100100/100
Data Confidencehighhigh

What the data shows

  • Ciaran is recorded with a Irish, from Old Irish ciar ('dark') origin, while Jack is recorded with a English, historically a diminutive of John origin.
  • Ciaran has 2 syllables, compared with 1 for Jack.
  • Ciaran's recorded meaning differs from Jack'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

Ciaran

Popularity journey

  1. First recorded1964

    First recorded at #49 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

  2. Highest recorded1964–2025

    Highest recorded position: #23 among boys in Republic of Ireland, in 2000 (recorded 1964–2025).

    Republic of Ireland · Boys

  3. Most recent2025

    Most recently recorded at #953 among boys in England and Wales, in 2025.

    England and Wales · Boys

Jack

Popularity journey

  1. 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

  2. Highest recorded1996–2025

    Highest recorded position: #1 among boys in England and Wales, in 1996 (recorded 1996–2025).

    England and Wales · Boys

  3. Most recent2025

    Most recently recorded at #24 among boys in England and Wales, in 2025.

    England and Wales · Boys