Namewise

Kai vs Thomas

Kai and Thomascompared 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, Kai was ranked #69 and Thomas #11 among boys in Northern Ireland.

  • New South Wales, Australia · Boys

    In 2025, Kai was ranked #23 and Thomas #13 among boys in New South Wales, Australia.

  • Republic of Ireland · Boys

    In 2025, Kai was ranked #34 and Thomas #16 among boys in Republic of Ireland.

  • Scotland · Boys

    In 2024, Kai was ranked #56 and Thomas #20 among boys in Scotland.

  • England and Wales · Boys

    In 2025, Kai was ranked #78 and Thomas #35 among boys in England and Wales.

  • Norway · Boys

    In 2025, Kai was ranked #282 and Thomas #106 among boys in Norway.

Kai and Thomas over time

Kai and Thomas appear together in 5 published lists, across 189 years of shared records. Thomas held the stronger position in more years in 5 of them, Kai 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.

Thomas reached its own highest recorded position earlier in 5 of those lists, and Kai 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 moved ahead of the other

    In 1967, Thomas moved ahead of Kai in Norway · Boys — #65 and #76 the year before became #66 and #52.

  • Closest over the longest run

    Across 23 shared years in New South Wales, Australia · Boys, Kai and Thomas averaged 48.7 places apart, ending at #23 and #13.

  • Longest-running competitions

    Kai and Thomas were both ranked in England and Wales · Boys for 30 years, from 1996 to 2025, ending at #78 and #35.

  • Peaked in the same years

    Both reached their highest recorded position in Northern Ireland · Boys within 2 years — Kai #52 in 2021, Thomas #6 in 2020.

List by list

  • Norway · Boys81 shared years, 1945–2025

    Kai held the stronger position in 22 of those years, Thomas in 59.

    Highest recorded here: Kai #57 in 1976, Thomas #1 in 1974.

    The order changed in 1967: Thomas moved ahead. In 1966 they stood at #65 and #76; by 1967 that had become #66 and #52.

    Most recent shared year, 2025: Kai #282, Thomas #106.

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

    Kai held the stronger position in 0 of those years, Thomas in 30.

    Highest recorded here: Kai #56 in 2003, Thomas #2 in 1998.

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

    Most recent shared year, 2025: Kai #78, Thomas #35.

  • Republic of Ireland · Boys28 shared years, 1997–2025

    Kai held the stronger position in 0 of those years, Thomas in 28.

    Highest recorded here: Kai #30 in 2024, Thomas #11 in 2013.

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

    Most recent shared year, 2025: Kai #34, Thomas #16.

  • Northern Ireland · Boys27 shared years, 1998–2024

    Kai held the stronger position in 0 of those years, Thomas in 27.

    Highest recorded here: Kai #52 in 2021, Thomas #6 in 2020.

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

    Most recent shared year, 2024: Kai #69, Thomas #11.

  • New South Wales, Australia · Boys23 shared years, 2002–2025

    Kai held the stronger position in 0 of those years, Thomas in 23.

    Highest recorded here: Kai #20 in 2023, Thomas #4 in 2002.

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

    Most recent shared year, 2025: Kai #23, Thomas #13.

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 Kai

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

Other comparisons involving Thomas

Pairs where Thomas 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 Norway lists

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

Norway 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 Kai, Thomas
FieldKaiThomas
Record typeOfficial statistical record (evidence-only)Editorially researched profile
Gender usagemalemale
MeaningNot yet recordedThe Greek form of the Aramaic name meaning 'twin'.
OriginNot yet recordedAramaic, via Greek
PronunciationNot yet recorded/ˈtɑməs/
Syllables12
Common variants / nicknamesNot yet recordedNot yet recorded
Recorded regional usageAU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NOAU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO, NZ
Most recent popularity observationNew South Wales, Australia · Boys #23 (2025)New South Wales, Australia · Boys #13 (2025)
Pronunciation clarity (demonstration score)Not yet recorded90/100
Spelling simplicity (demonstration score)95/10088/100
International familiarity (demonstration score)100/100100/100
Data Confidencemediummedium

What the data shows

  • Thomas has a recorded origin (Aramaic, via Greek); Kai does not have one recorded yet.
  • Kai has 1 syllable, compared with 2 for Thomas.
  • A meaning is recorded for Thomas; Kai doesn't have one written yet.
  • Both names have recorded usage in AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO.

How each name got here

Kai

Popularity journey

  1. First recorded1945

    First recorded at #76 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 recorded2002–2025

    Highest recorded position: #20 among boys in New South Wales, Australia, in 2023 (recorded 2002–2025).

    New South Wales, Australia · Boys

  3. Most recent2025

    Most recently recorded at #4867 among girls in England and Wales, in 2025.

    England and Wales · Girls

Thomas

Popularity journey

  1. First recorded1945

    First recorded at #177 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 recorded1945–2025

    Highest recorded position: #1 among boys in Norway, in 1974 (recorded 1945–2025).

    Norway · Boys

  3. Most recent2025

    Most recently recorded at #35 among boys in England and Wales, in 2025.

    England and Wales · Boys