Thomasin
Meaning: “twin”
About the name Thomasin
Thomasin is a girl name with Aramaic roots, meaning “twin”. It is related to Thomas, which is where the meaning comes from.
It has a unique feel. In 2025, Thomasin ranked #8817 for girls in the US, with 12 babies given the name. Its peak year since 1940 was 2023. Since 2000, 100% of US babies named Thomasin were girls.
Etymology
A feminine form of Thomas, which comes from Aramaic, meaning “twin”.
Name meaning adapted from Wiktionary (“Thomasin”, “Thomas”) by Wiktionary contributors, CC BY-SA 4.0.
- US rank 2025
- #8817
- In 2015
- Not ranked
- Babies in 2025
- 12
Popularity of Thomasin, 1940–2025
Latest SSA data: 2025.
Popularity data: U.S. Social Security Administration national baby names (public domain; names given to at least 5 babies of one sex per year).
Names similar to Thomasin
Name meanings marked or linked “Wiktionary” are adapted from Wiktionary by Wiktionary contributors, CC BY-SA 4.0; each name page links its source entry.