Daithi vs Theo
Daithi and Theocompared 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, Daithi was ranked #17 and Theo #5 among boys in Northern Ireland.
England and Wales · Boys
In 2024, Daithi was ranked #3254 and Theo #12 among boys in England and Wales.
Republic of Ireland · Boys
In 2025, Daithi was ranked #509 and Theo #21 among boys in Republic of Ireland.
Daithi and Theo over time
Daithi and Theo appear together in 3 published lists, across 62 years of shared records. Theo held the stronger position in more years in 2 of them, Daithi in 1.
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.
Daithi reached its own highest recorded position earlier in 2 of those lists, Theo 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 2018, Theo moved ahead of Daithi in Republic of Ireland · Boys — #71 and #73 the year before became #471 and #62.
- Repeatedly exchanged positions
Daithi and Theo changed places 4 times in Northern Ireland · Boys between 2001 and 2024, ending at #17 and #5.
- Closest over the longest run
Across 22 shared years in Northern Ireland · Boys, Daithi and Theo averaged 28.4 places apart, ending at #17 and #5.
- Mirrored each other
Over 28 shared years in Republic of Ireland · Boys, Theo rose about as far as Daithi fell — from #254 and #319 in 1988 to #509 and #21 in 2025.
- Peaked in the same years
Both reached their highest recorded position in Northern Ireland · Boys within 2 years — Daithi #17 in 2023, Theo #4 in 2022.
List by list
Republic of Ireland · Boys28 shared years, 1988–2025
Daithi held the stronger position in 18 of those years, Theo in 9.
Highest recorded here: Daithi #71 in 2017, Theo #17 in 2023.
The order changed in 2018: Theo moved ahead. In 2017 they stood at #71 and #73; by 2018 that had become #471 and #62.
Most recent shared year, 2025: Daithi #509, Theo #21.
Northern Ireland · Boys22 shared years, 2001–2024
Daithi held the stronger position in 7 of those years, Theo in 14.
Highest recorded here: Daithi #17 in 2023, Theo #4 in 2022.
The order between them never changed and held in this list.
Most recent shared year, 2024: Daithi #17, Theo #5.
England and Wales · Boys12 shared years, 2009–2024
Daithi held the stronger position in 0 of those years, Theo in 12.
Highest recorded here: Daithi #3011 in 2018, Theo #9 in 2022.
The order between them never changed and held in this list.
Most recent shared year, 2024: Daithi #3254, Theo #12.
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 | Daithi | Theo |
|---|---|---|
| Record type | Official statistical record (evidence-only) | Editorially researched profile |
| Gender usage | male | male |
| Meaning | Not yet recorded | Gift of God. |
| Origin | Not yet recorded | Greek, via Theodore/Theodora |
| Pronunciation | Not yet recorded | /ˈθioʊ/ |
| Syllables | 2 | 1 |
| Common variants / nicknames | Not yet recorded | Teddy |
| Recorded regional usage | GB-ENW, GB-NIR, IE | AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO, NZ |
| Most recent popularity observation | Republic of Ireland · Boys #509 (2025) | Republic of Ireland · Boys #21 (2025) |
| Pronunciation clarity (demonstration score) | Not yet recorded | 90/100 |
| Spelling simplicity (demonstration score) | 88/100 | 95/100 |
| International familiarity (demonstration score) | 100/100 | 100/100 |
| Data Confidence | medium | high |
What the data shows
- Theo has a recorded origin (Greek, via Theodore/Theodora); Daithi does not have one recorded yet.
- Daithi has 2 syllables, compared with 1 for Theo.
- A meaning is recorded for Theo; Daithi doesn't have one written yet.
- Both names have recorded usage in GB-ENW, GB-NIR, IE.
- The available evidence gives Daithi a "medium" Data Confidence level and Theo a "high" level — this reflects how complete and corroborated the underlying evidence is, not a judgement of either name.
How each name got here
Daithi
Popularity journey
First recorded1973
First recorded at #320 among boys in Republic of Ireland in 1973 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Republic of Ireland · Boys
Highest recorded1999–2024
Highest recorded position: #17 among boys in Northern Ireland, in 2023 (recorded 1999–2024).
Northern Ireland · Boys
Most recent2025
Most recently recorded at #509 among boys in Republic of Ireland, in 2025.
Republic of Ireland · Boys
Theo
Popularity journey
First recorded1986
First recorded at #637 among boys in Norway in 1986 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Norway · Boys
Highest recorded2001–2024
Highest recorded position: #4 among boys in Northern Ireland, in 2022 (recorded 2001–2024).
Northern Ireland · Boys
Most recent2025
Most recently recorded at #32 among boys in New South Wales, Australia, in 2025.
New South Wales, Australia · Boys