Heidi vs Thea
Heidi and Theacompared 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.
Norway · Girls
In 2025, Heidi was ranked #437 and Thea #50 among girls in Norway.
New Zealand · Girls
In 2022, Heidi was ranked #99 and Thea #62 among girls in New Zealand.
Northern Ireland · Girls
In 2024, Heidi was ranked #65 and Thea #75 among girls in Northern Ireland.
Scotland · Girls
In 2024, Heidi was ranked #95 and Thea #65 among girls in Scotland.
England and Wales · Girls
In 2024, Heidi was ranked #107 and Thea #66 among girls in England and Wales.
New South Wales, Australia · Girls
In 2016, Heidi was ranked #90 and Thea #91 among girls in New South Wales, Australia.
Republic of Ireland · Girls
In 2025, Heidi was ranked #91 and Thea #207 among girls in Republic of Ireland.
Heidi and Thea over time
Heidi and Thea appear together in 4 published lists, across 137 years of shared records. Heidi held the stronger position in more years in 3 of them, Thea in 1.
The order between them changed and held in 3 of those lists — a change in that published list, never a claim that one name displaced the other.
Heidi reached its own highest recorded position earlier in 3 of those lists, Thea 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 2014, Thea moved ahead of Heidi in England and Wales · Girls — #99 and #121 the year before became #84 and #79.
- Repeatedly exchanged positions
Heidi and Thea changed places 4 times in Northern Ireland · Girls between 2004 and 2024, ending at #65 and #75.
- Mirrored each other
Over 63 shared years in Norway · Girls, Thea rose about as far as Heidi fell — from #232 and #380 in 1950 to #437 and #50 in 2025.
- Longest-running competitions
Heidi and Thea were both ranked in Norway · Girls for 63 years, from 1950 to 2025, ending at #437 and #50.
- Peaked in the same years
Both reached their highest recorded position in Northern Ireland · Girls within 2 years — Heidi #48 in 2021, Thea #40 in 2019.
List by list
Norway · Girls63 shared years, 1950–2025
Heidi held the stronger position in 27 of those years, Thea in 36.
Highest recorded here: Heidi #2 in 1965, Thea #1 in 2006.
The order changed in 1990: Thea moved ahead. In 1989 they stood at #29 and #61; by 1990 that had become #48 and #44.
Most recent shared year, 2025: Heidi #437, Thea #50.
England and Wales · Girls29 shared years, 1996–2024
Heidi held the stronger position in 18 of those years, Thea in 11.
Highest recorded here: Heidi #76 in 2016, Thea #46 in 2019.
The order changed in 2014: Thea moved ahead. In 2013 they stood at #99 and #121; by 2014 that had become #84 and #79.
Most recent shared year, 2024: Heidi #107, Thea #66.
Republic of Ireland · Girls26 shared years, 1996–2025
Heidi held the stronger position in 23 of those years, Thea in 3.
Highest recorded here: Heidi #74 in 2019, Thea #136 in 2021.
The order changed in 2005: Heidi moved ahead. In 2004 they stood at #370 and #340; by 2005 that had become #263 and #523.
Most recent shared year, 2025: Heidi #91, Thea #207.
Northern Ireland · Girls19 shared years, 2004–2024
Heidi held the stronger position in 14 of those years, Thea in 5.
Highest recorded here: Heidi #48 in 2021, Thea #40 in 2019.
The order between them never changed and held in this list.
Most recent shared year, 2024: Heidi #65, Thea #75.
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 | Heidi | Thea |
|---|---|---|
| Record type | Editorially researched profile | Editorially researched profile |
| Gender usage | female | female |
| Meaning | A German diminutive of Adelheid. Gained wide recognition through Johanna Spyri's 1880 children's novel Heidi, and its 1937 film adaptation starring Shirley Temple. | A short form of Dorothea, Theodora, Theresa and other similar-sounding Greek-rooted names. |
| Origin | Germanic, diminutive of Adelheid | Greek (via Germanic/Scandinavian transmission) |
| Pronunciation | /ˈhaɪ̯.di/ | /ˈteː.a/ |
| Syllables | 2 | 1 |
| Common variants / nicknames | Not yet recorded | Not yet recorded |
| Recorded regional usage | AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO, NZ | AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO, NZ |
| Most recent popularity observation | Republic of Ireland · Girls #91 (2025) | Norway · Girls #50 (2025) |
| Pronunciation clarity (demonstration score) | 90/100 | 90/100 |
| Spelling simplicity (demonstration score) | 94/100 | 95/100 |
| International familiarity (demonstration score) | 100/100 | 100/100 |
| Data Confidence | medium | medium |
What the data shows
- Heidi is recorded with a Germanic, diminutive of Adelheid origin, while Thea is recorded with a Greek (via Germanic/Scandinavian transmission) origin.
- Heidi has 2 syllables, compared with 1 for Thea.
- Heidi's recorded meaning differs from Thea's — see the table above for each.
- Both names have recorded usage in AU-NSW, GB-ENW, GB-NIR, GB-SCT, IE, NO, NZ.
How each name got here
Heidi
Popularity journey
First recorded1945
First recorded at #188 among girls in Norway in 1945 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Norway · Girls
Highest recorded1945–2025
Highest recorded position: #2 among girls in Norway, in 1965 (recorded 1945–2025).
Norway · Girls
Most recent2025
Most recently recorded at #437 among girls in Norway, in 2025.
Norway · Girls
Thea
Popularity journey
First recorded1950
First recorded at #380 among girls in Norway in 1950 — the earliest year that source publishes this name, not necessarily the earliest it was used.
Norway · Girls
Highest recorded1950–2025
Highest recorded position: #1 among girls in Norway, in 2006 (recorded 1950–2025).
Norway · Girls
Most recent2025
Most recently recorded at #50 among girls in Norway, in 2025.
Norway · Girls