Kai vs Leif
Kai and Leifcompared 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.
England and Wales · Boys
In 2024, Kai was ranked #72 and Leif #814 among boys in England and Wales.
Norway · Boys
In 2025, Kai was ranked #282 and Leif #225 among boys in Norway.
Kai and Leif over time
Kai and Leif appear together in 2 published lists, across 107 years of shared records. Neither was ahead in more lists than the other.
In none of those lists did their order change and stay changed.
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.
- Repeatedly exchanged positions
Kai and Leif changed places 20 times in Norway · Boys between 1945 and 2025, ending at #282 and #225.
- Closest over the longest run
Across 81 shared years in Norway · Boys, Kai and Leif averaged 44.9 places apart, ending at #282 and #225.
- Longest-running competitions
Kai and Leif were both ranked in Norway · Boys for 81 years, from 1945 to 2025, ending at #282 and #225.
List by list
Norway · Boys81 shared years, 1945–2025
Kai held the stronger position in 17 of those years, Leif in 64.
Highest recorded here: Kai #57 in 1976, Leif #17 in 1945.
The order between them never changed and held in this list.
Most recent shared year, 2025: Kai #282, Leif #225.
England and Wales · Boys26 shared years, 1996–2024
Kai held the stronger position in 26 of those years, Leif in 0.
Highest recorded here: Kai #56 in 2003, Leif #814 in 2024.
The order between them never changed and held in this list.
Most recent shared year, 2024: Kai #72, Leif #814.
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 | Kai | Leif |
|---|---|---|
| Record type | Official statistical record (evidence-only) | Editorially researched profile |
| Gender usage | male | male |
| Meaning | Not yet recorded | Commonly interpreted as 'heir' or 'descendant'. |
| Origin | Not yet recorded | Old Norse |
| Pronunciation | Not yet recorded | /leɪf/ (also /liːf/) |
| Syllables | 1 | 1 |
| Common variants / nicknames | Not yet recorded | Leiv |
| Recorded regional usage | AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO | GB-ENW, NO |
| Most recent popularity observation | New South Wales, Australia · Boys #23 (2025) | Sweden #88 (2025) |
| Pronunciation clarity (demonstration score) | Not yet recorded | 90/100 |
| Spelling simplicity (demonstration score) | 95/100 | 95/100 |
| International familiarity (demonstration score) | 100/100 | 60/100 |
| Data Confidence | medium | high |
What the data shows
- Leif has a recorded origin (Old Norse); Kai does not have one recorded yet.
- Kai and Leif both have 1 syllable.
- A meaning is recorded for Leif; Kai doesn't have one written yet.
- Both names have recorded usage in GB-ENW, NO.
- The available evidence gives Kai a "medium" Data Confidence level and Leif a "high" level — this reflects how complete and corroborated the underlying evidence is, not a judgement of either name.
How each name got here
Kai
Popularity journey
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
Highest recorded2002–2025
Highest recorded position: #20 among boys in New South Wales, Australia, in 2023 (recorded 2002–2025).
New South Wales, Australia · Boys
Most recent2025
Most recently recorded at #23 among boys in New South Wales, Australia, in 2025.
New South Wales, Australia · Boys
Leif
Popularity journey
First recorded1945
First recorded at #17 among boys in Norway in 1945 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Norway · Boys
Highest recorded1945–2025
Highest recorded position: #17 among boys in Norway, in 1945 (recorded 1945–2025).
Norway · Boys
Most recent2025
Most recently recorded at #225 among boys in Norway, in 2025.
Norway · Boys