Namewise

Henry vs Kai

Henry and Kaicompared 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.

  • New South Wales, Australia · Boys

    In 2025, Henry was ranked #6 and Kai #23 among boys in New South Wales, Australia.

  • England and Wales · Boys

    In 2025, Henry was ranked #13 and Kai #78 among boys in England and Wales.

  • Republic of Ireland · Boys

    In 2025, Henry was ranked #76 and Kai #34 among boys in Republic of Ireland.

  • Northern Ireland · Boys

    In 2024, Henry was ranked #45 and Kai #69 among boys in Northern Ireland.

  • Norway · Boys

    In 2025, Henry was ranked #50 and Kai #282 among boys in Norway.

  • Scotland · Boys

    In 2024, Henry was ranked #95 and Kai #56 among boys in Scotland.

Henry and Kai over time

Henry and Kai appear together in 5 published lists, across 188 years of shared records. Henry held the stronger position in more years in 4 of them, Kai in 1.

The order between them changed and held in 2 of those lists — a change in that published list, never a claim that one name displaced the other.

Kai reached its own highest recorded position earlier in 3 of those lists, Henry in 1. 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 2019, Kai moved ahead of Henry in Republic of Ireland · Boys — #81 and #84 the year before became #83 and #65.

  • Repeatedly exchanged positions

    Henry and Kai changed places 4 times in Northern Ireland · Boys between 1998 and 2024, ending at #45 and #69.

  • Closest over the longest run

    Across 30 shared years in England and Wales · Boys, Henry and Kai averaged 48.5 places apart, ending at #13 and #78.

  • Longest-running competitions

    Henry and Kai were both ranked in England and Wales · Boys for 30 years, from 1996 to 2025, ending at #13 and #78.

  • Peaked in the same years

    Both reached their highest recorded position in New South Wales, Australia · Boys within 2 years — Henry #4 in 2023, Kai #20 in 2023.

List by list

  • Norway · Boys81 shared years, 1945–2025

    Henry held the stronger position in 26 of those years, Kai in 55.

    Highest recorded here: Henry #50 in 2025, Kai #57 in 1976.

    The order changed in 2002: Henry moved ahead. In 2001 they stood at #412 and #264; by 2002 that had become #309 and #411.

    Most recent shared year, 2025: Henry #50, Kai #282.

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

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

    Highest recorded here: Henry #10 in 2021, Kai #56 in 2003.

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

    Most recent shared year, 2025: Henry #13, Kai #78.

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

    Henry held the stronger position in 15 of those years, Kai in 13.

    Highest recorded here: Henry #75 in 2016, Kai #30 in 2024.

    The order changed in 2019: Kai moved ahead. In 2018 they stood at #81 and #84; by 2019 that had become #83 and #65.

    Most recent shared year, 2025: Henry #76, Kai #34.

  • Northern Ireland · Boys27 shared years, 1998–2024

    Henry held the stronger position in 16 of those years, Kai in 10.

    Highest recorded here: Henry #22 in 2023, Kai #52 in 2021.

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

    Most recent shared year, 2024: Henry #45, Kai #69.

  • New South Wales, Australia · Boys22 shared years, 2002–2025

    Henry held the stronger position in 21 of those years, Kai in 1.

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

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

    Most recent shared year, 2025: Henry #6, Kai #23.

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 Henry

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

Other comparisons involving Kai

Pairs where Kai 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 — moved together in several countries.

  • Christopher vs Paul

    Christopher and Paul both fell over the same years in 6 registrars — England and Wales · Boys; New South Wales, Australia · Boys; New Zealand · Boys; Northern Ireland · Boys; Norway · Boys; Republic of Ireland · Boys. Each list is measured against its own starting position; the positions are never combined.

    Christopher · Paul · 80 shared years, 1946–2025 · Moved together in several countries

  • Oliver vs Leo

    Oliver and Leo both rose over the same years in 6 registrars — England and Wales · Boys; New South Wales, Australia · Boys; New Zealand · Boys; Northern Ireland · Boys; Norway · Boys; Republic of Ireland · Boys. Each list is measured against its own starting position; the positions are never combined.

    Oliver · Leo · 63 shared years, 1959–2025 · Moved together in several countries

  • Oliver vs Luca

    Oliver and Luca both rose over the same years in 6 registrars — England and Wales · Boys; New South Wales, Australia · Boys; New Zealand · Boys; Northern Ireland · Boys; Norway · Boys; Republic of Ireland · Boys. Each list is measured against its own starting position; the positions are never combined.

    Oliver · Luca · 43 shared years, 1973–2025 · Moved together in several countries

  • Amelia vs Sofia

    Amelia and Sofia both rose over the same years in 5 registrars — England and Wales · Girls; New South Wales, Australia · Girls; Northern Ireland · Girls; Norway · Girls; Republic of Ireland · Girls. Each list is measured against its own starting position; the positions are never combined.

    Amelia · Sofia · 36 shared years, 1972–2025 · Moved together in several countries

All moved together in several countries→

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 Henry, Kai
FieldHenryKai
Record typeEditorially researched profileOfficial statistical record (evidence-only)
Gender usagemalemale
MeaningHome ruler, estate ruler.Not yet recorded
OriginGermanic, via Old French HenriNot yet recorded
Pronunciation/ˈhɛnɹi/Not yet recorded
Syllables21
Common variants / nicknamesHarry, Hal, Heinrich, HenriNot yet recorded
Recorded regional usageAU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO, NZAU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO
Most recent popularity observationNew South Wales, Australia · Boys #6 (2025)New South Wales, Australia · Boys #23 (2025)
Pronunciation clarity (demonstration score)90/100Not yet recorded
Spelling simplicity (demonstration score)94/10095/100
International familiarity (demonstration score)100/100100/100
Data Confidencehighmedium

What the data shows

  • Henry has a recorded origin (Germanic, via Old French Henri); Kai does not have one recorded yet.
  • Henry has 2 syllables, compared with 1 for Kai.
  • A meaning is recorded for Henry; Kai doesn't have one written yet.
  • Both names have recorded usage in AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO.
  • The available evidence gives Henry a "high" Data Confidence level and Kai a "medium" level — this reflects how complete and corroborated the underlying evidence is, not a judgement of either name.

How each name got here

Henry

Popularity journey

  1. First recorded1945

    First recorded at #102 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 recorded1993–2025

    Highest recorded position: #4 among boys in New South Wales, Australia, in 2023 (recorded 1993–2025).

    New South Wales, Australia · Boys

  3. Most recent2025

    Most recently recorded at #13 among boys in England and Wales, in 2025.

    England and Wales · Boys

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