Arthur vs Kajus
Arthur and Kajuscompared 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, Arthur was ranked #4 and Kajus #2088 among boys in England and Wales.
Northern Ireland · Boys
In 2020, Arthur was ranked #21 and Kajus #334 among boys in Northern Ireland.
Republic of Ireland · Boys
In 2025, Arthur was ranked #57 and Kajus #829 among boys in Republic of Ireland.
Arthur and Kajus over time
Arthur and Kajus appear together in 3 published lists, across 52 years of shared records. Arthur held the stronger position in more years in 3 of them, Kajus 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.
Kajus reached its own highest recorded position earlier in 3 of those lists, and Arthur 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
England and Wales · Boys21 shared years, 2004–2024
Arthur held the stronger position in 21 of those years, Kajus in 0.
Highest recorded here: Arthur #3 in 2020, Kajus #611 in 2013.
The order between them never changed and held in this list.
Most recent shared year, 2024: Arthur #4, Kajus #2088.
Republic of Ireland · Boys19 shared years, 2006–2025
Arthur held the stronger position in 19 of those years, Kajus in 0.
Highest recorded here: Arthur #47 in 2024, Kajus #211 in 2010.
The order between them never changed and held in this list.
Most recent shared year, 2025: Arthur #57, Kajus #829.
Northern Ireland · Boys12 shared years, 2007–2020
Arthur held the stronger position in 10 of those years, Kajus in 1.
Highest recorded here: Arthur #19 in 2019, Kajus #204 in 2012.
The order changed in 2010: Arthur moved ahead. In 2009 they stood at #293 and #262; by 2010 that had become #248 and #387.
Most recent shared year, 2020: Arthur #21, Kajus #334.
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 | Arthur | Kajus |
|---|---|---|
| Record type | Editorially researched profile | Official statistical record (evidence-only) |
| Gender usage | male | male |
| Meaning | Meaning debated — no single origin is established with confidence. | Not yet recorded |
| Origin | Disputed — possibly Celtic (Brittonic), possibly Roman | Not yet recorded |
| Pronunciation | /ˈɑɹθər/ | Not yet recorded |
| Syllables | 2 | 2 |
| Common variants / nicknames | Art, Artie | Not yet recorded |
| Recorded regional usage | AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO, NZ | GB-ENW, GB-NIR, IE |
| Most recent popularity observation | New South Wales, Australia · Boys #19 (2025) | Republic of Ireland · Boys #829 (2025) |
| Pronunciation clarity (demonstration score) | 90/100 | Not yet recorded |
| Spelling simplicity (demonstration score) | 88/100 | 94/100 |
| International familiarity (demonstration score) | 100/100 | 100/100 |
| Data Confidence | high | medium |
What the data shows
- Arthur has a recorded origin (Disputed — possibly Celtic (Brittonic), possibly Roman); Kajus does not have one recorded yet.
- Arthur and Kajus both have 2 syllables.
- A meaning is recorded for Arthur; Kajus doesn't have one written yet.
- Both names have recorded usage in GB-ENW, GB-NIR, IE.
- The available evidence gives Arthur a "high" Data Confidence level and Kajus a "medium" level — this reflects how complete and corroborated the underlying evidence is, not a judgement of either name.
How each name got here
Arthur
Popularity journey
First recorded1945
First recorded at #153 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: #3 among boys in England and Wales, in 2020 (recorded 1996–2024).
England and Wales · Boys
Most recent2025
Most recently recorded at #19 among boys in New South Wales, Australia, in 2025.
New South Wales, Australia · Boys
Kajus
Popularity journey
First recorded2004
First recorded at #2304 among boys in England and Wales in 2004 — the earliest year that source publishes this name, not necessarily the earliest it was used.
England and Wales · Boys
Highest recorded2007–2020
Highest recorded position: #204 among boys in Northern Ireland, in 2012 (recorded 2007–2020).
Northern Ireland · Boys
Most recent2025
Most recently recorded at #829 among boys in Republic of Ireland, in 2025.
Republic of Ireland · Boys