Fiontan vs Theo

Fiontan 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 2023, Fiontan was ranked #395 and Theo #9 among boys in Northern Ireland.

Fiontan and Theo over time

Fiontan and Theo appear together in 1 published list, across 9 years of shared records. Theo held the stronger position in more years in 1 of them, Fiontan 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.

Fiontan reached its own highest recorded position earlier in 1 of those lists, and Theo 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

Northern Ireland · Boys9 shared years, 2003–2023
Fiontan held the stronger position in 2 of those years, Theo in 7.
Highest recorded here: Fiontan #207 in 2006, Theo #7 in 2020.
The order changed in 2007: Theo moved ahead. In 2006 they stood at #207 and #282; by 2007 that had become #276 and #179.
Most recent shared year, 2023: Fiontan #395, Theo #9.

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 Theo

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

Arthur vs Theo
Arthur and Theo both rose over the same years in 5 registrars — England and Wales · 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.
Arthur · Theo · 37 shared years, 1986–2025 · Moved together in several countries
Henry vs Theo
Henry and Theo both rose over the same years in 5 registrars — England and Wales · 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.
Henry · Theo · 37 shared years, 1986–2025 · Moved together in several countries
Theo vs Archie
Theo and Archie both rose over the same years in 4 registrars — England and Wales · Boys; New Zealand · Boys; Northern Ireland · Boys; Republic of Ireland · Boys. Each list is measured against its own starting position; the positions are never combined.
Theo · Archie · 30 shared years, 1996–2025 · Moved together in several countries
Theo vs Arlo
Theo and Arlo both rose over the same years in 4 registrars — England and Wales · Boys; New Zealand · Boys; Northern Ireland · Boys; Republic of Ireland · Boys. Each list is measured against its own starting position; the positions are never combined.
Theo · Arlo · 27 shared years, 1999–2025 · Moved together in several countries

Side by side

Side-by-side comparison of Fiontan, Theo
Field	Fiontan	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-NIR, IE	AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO, NZ
Most recent popularity observation	Northern Ireland · Boys #395 (2023)	Republic of Ireland · Boys #21 (2025)
Pronunciation clarity (demonstration score)	Not yet recorded	90/100
Spelling simplicity (demonstration score)	82/100	95/100
International familiarity (demonstration score)	60/100	100/100
Data Confidence	medium	high

What the data shows

Theo has a recorded origin (Greek, via Theodore/Theodora); Fiontan does not have one recorded yet.
Fiontan has 2 syllables, compared with 1 for Theo.
A meaning is recorded for Theo; Fiontan doesn't have one written yet.
Both names have recorded usage in GB-NIR, IE.
The available evidence gives Fiontan 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

Fiontan

Popularity journey

First recorded2003
First recorded at #263 among boys in Northern Ireland in 2003 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Northern Ireland · Boys
Highest recorded2003–2023
Highest recorded position: #207 among boys in Northern Ireland, in 2006 (recorded 2003–2023).
Northern Ireland · Boys
Most recent2023
Most recently recorded at #395 among boys in Northern Ireland, in 2023.
Northern 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