Arlo vs Theodore
Arlo and Theodorecompared 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, Arlo was ranked #47 and Theodore #3 among boys in New South Wales, Australia.
New Zealand · Boys
In 2023, Arlo was ranked #12 and Theodore #6 among boys in New Zealand.
England and Wales · Boys
In 2024, Arlo was ranked #15 and Theodore #8 among boys in England and Wales.
Scotland · Boys
In 2024, Arlo was ranked #18 and Theodore #36 among boys in Scotland.
Northern Ireland · Boys
In 2024, Arlo was ranked #45 and Theodore #32 among boys in Northern Ireland.
Republic of Ireland · Boys
In 2025, Arlo was ranked #54 and Theodore #44 among boys in Republic of Ireland.
Arlo and Theodore over time
Arlo and Theodore appear together in 5 published lists, across 77 years of shared records. Theodore held the stronger position in more years in 4 of them, Arlo 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.
Arlo reached its own highest recorded position earlier in 4 of those lists, Theodore 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 took the other's place near the top
In Republic of Ireland · Boys, Theodore moved into the top 50 at #44 in 2025 as Arlo fell out of it to #54, having been #48 the year before.
- One moved ahead of the other
In 2020, Theodore moved ahead of Arlo in New Zealand · Boys — #11 and #15 the year before became #16 and #15.
- Repeatedly exchanged positions
Arlo and Theodore changed places 4 times in Northern Ireland · Boys between 2011 and 2024, ending at #45 and #32.
- Peaked in the same years
Both reached their highest recorded position in England and Wales · Boys within 2 years — Arlo #14 in 2023, Theodore #8 in 2022.
List by list
England and Wales · Boys26 shared years, 1999–2024
Arlo held the stronger position in 0 of those years, Theodore in 26.
Highest recorded here: Arlo #14 in 2023, Theodore #8 in 2022.
The order between them never changed and held in this list.
Most recent shared year, 2024: Arlo #15, Theodore #8.
Republic of Ireland · Boys17 shared years, 2009–2025
Arlo held the stronger position in 4 of those years, Theodore in 13.
Highest recorded here: Arlo #48 in 2024, Theodore #44 in 2025.
The order changed in 2025: Theodore moved ahead. In 2024 they stood at #48 and #56; by 2025 that had become #54 and #44.
Most recent shared year, 2025: Arlo #54, Theodore #44.
Northern Ireland · Boys12 shared years, 2011–2024
Arlo held the stronger position in 5 of those years, Theodore in 6.
Highest recorded here: Arlo #40 in 2023, Theodore #32 in 2024.
The order between them never changed and held in this list.
Most recent shared year, 2024: Arlo #45, Theodore #32.
New South Wales, Australia · Boys11 shared years, 2015–2025
Arlo held the stronger position in 0 of those years, Theodore in 11.
Highest recorded here: Arlo #19 in 2023, Theodore #3 in 2024.
The order between them never changed and held in this list.
Most recent shared year, 2025: Arlo #47, Theodore #3.
New Zealand · Boys11 shared years, 2013–2023
Arlo held the stronger position in 7 of those years, Theodore in 4.
Highest recorded here: Arlo #10 in 2017, Theodore #6 in 2022.
The order changed in 2020: Theodore moved ahead. In 2019 they stood at #11 and #15; by 2020 that had become #16 and #15.
Most recent shared year, 2023: Arlo #12, Theodore #6.
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 | Arlo | Theodore |
|---|---|---|
| Record type | Editorially researched profile | Editorially researched profile |
| Gender usage | male | male |
| Meaning | Meaning uncertain — likely derived by Edmund Spenser from the real Irish place name Aherlow ('between two highlands') for the fictional Arlo Hill in The Faerie Queene (1590). | Gift of God. |
| Origin | Irish (place name origin, via literary adaptation) | Greek |
| Pronunciation | /ˈɑɹ.loʊ/ | /ˈθiəˌdɔɹ/ |
| Syllables | 2 | 3 |
| Common variants / nicknames | Not yet recorded | Teddy |
| Recorded regional usage | AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NZ | AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NZ |
| Most recent popularity observation | New South Wales, Australia · Boys #47 (2025) | New South Wales, Australia · Boys #3 (2025) |
| Pronunciation clarity (demonstration score) | 90/100 | 90/100 |
| Spelling simplicity (demonstration score) | 95/100 | 76/100 |
| International familiarity (demonstration score) | 100/100 | 100/100 |
| Data Confidence | medium | high |
What the data shows
- Arlo is recorded with a Irish (place name origin, via literary adaptation) origin, while Theodore is recorded with a Greek origin.
- Arlo has 2 syllables, compared with 3 for Theodore.
- Arlo's recorded meaning differs from Theodore's — see the table above for each.
- Both names have recorded usage in AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NZ.
- The available evidence gives Arlo a "medium" Data Confidence level and Theodore a "high" level — this reflects how complete and corroborated the underlying evidence is, not a judgement of either name.
How each name got here
Arlo
Popularity journey
First recorded1999
First recorded at #2943 among boys in England and Wales in 1999 — the earliest year that source publishes this name, not necessarily the earliest it was used.
England and Wales · Boys
Highest recorded2013–2023
Highest recorded position: #10 among boys in New Zealand, in 2017 (recorded 2013–2023).
New Zealand · Boys
Most recent2025
Most recently recorded at #47 among boys in New South Wales, Australia, in 2025.
New South Wales, Australia · Boys
Theodore
Popularity journey
First recorded1964
First recorded at #214 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
Highest recorded2015–2025
Highest recorded position: #3 among boys in New South Wales, Australia, in 2024 (recorded 2015–2025).
New South Wales, Australia · Boys
Most recent2025
Most recently recorded at #3 among boys in New South Wales, Australia, in 2025.
New South Wales, Australia · Boys