girl's name
Thomasin
- Gender Girl
- Letters 8
- Popularity Rare
- Births on record 90
Thomasin is a girl's name. In 2025 it was given to 12 babies in the United States. It is a rare choice.
- Peaked in 2023, when 16 babies were given the name.
- It is a recent arrival in the birth records.
- Today about 1 in 276,319 babies in the United States is given this name.
- First appears in US birth records in 1963.
Thomasin over time
Births per decade in the United States, 1960s to 2020s. The striped bar is the 2020s, still in progress — it covers 2020 to 2025, not a full ten years.
Show the numbers
| Decade | Births |
|---|---|
| 1960s | 5 |
| 1970s | 5 |
| 2020s (to 2025) | 62 |
How popular is Thomasin?
In 2025, Thomasin was given to 12 babies in the United States. It is a rare choice.
Where Thomasin is used
US figures omit any name given to fewer than five babies in a year, so the rarest names are absent from the source rather than absent from use. Data & sources.
Names that peaked alongside Thomasin
These names rose and fell in the same era, which is why they tend to sound like they belong together.
Sibling names for Thomasin
Names from the same era that won't rhyme or share an initial with Thomasin — the two things that make a sibling set grate.
Common questions about Thomasin
How popular is the name Thomasin?
In 2025, Thomasin was given to 12 babies in the United States. It is a rare choice.
Is Thomasin a girl's or a boy's name?
Thomasin is given almost entirely to girls in birth records.
When was Thomasin most popular?
Thomasin peaked in 2023, when 16 babies were given the name. It is a recent arrival in the birth records.
Is Thomasin a good name?
That is not something records can settle, but they can tell you what you would be choosing. Thomasin currently ranks #8,519 in the United States. It is a recent arrival in the birth records. Everything else — how it sounds with your surname, who it reminds you of — is yours.