Given name & surname
Thomasin
“twin”·“a twin”
In English use, Thomasin is a feminine form of Thomas. The original Aramaic byname means “twin.” Thomasin is a variant of Thomasina. In Hebrew use, Thomasina carries the interpretation “a twin.”
Meaning & origin
What it means
In English use, Thomasin is a feminine form of Thomas. The original Aramaic byname means “twin.” Thomasin is a variant of Thomasina. In Hebrew use, Thomasina carries the interpretation “a twin.”
Explained through its name family
Where it comes from
In English use, Thomasin is a feminine form of Thomas. Thomas developed from an Aramaic byname and reached wider use through its Greek biblical form.
Explained through its name family
How it developed
In English usage, Thomasin is a feminine form of Thomas. In English use, Thomasin is a feminine form of Thomas. The shared background comes through Thomas: The apostle is called Thomas and also Didymus in the New Testament. Didymus reflects the Greek word for “twin,” matching the meaning of the Aramaic byname behind Thomas.
Combines direct and name-family evidence
The story
Published U.S. birth records include this spelling as early as 1963. This is the earliest published observation available here, rather than a date for the name’s origin. In English use, Thomasin is a feminine form of Thomas. The history of Thomas gives this family its wider story. Thomas was the name of one of Jesus’s twelve apostles, remembered in Christian tradition for his doubts and later reassurance. That story helped establish the name across Christian naming traditions.
Combines direct and name-family evidence
Thomasin through the years
- Babies since 1880
- 72
- 0 boys · 72 girls
- Most popular year
- 2023
- 16 babies
- 2025
- 12
- #8,817 for girls
- 2021–25 vs 2016–20
- +100%
- Rising fast
By the numbers
In 2025, this name appeared in 12 U.S. birth records for girls, ranking No. 8,817 among girls’ names. The recent annual counts are too incomplete to establish a ten-year comparison.
From Social Security birth records and U.S. Census name counts for this exact spelling. Other spellings are counted separately.
Thomasin’s family of names
In English usage, Thomasin is a feminine form of Thomas. Thomasin has a related form in Thomasina. In English usage, Thomasin has a related form in Thomasine.
Inner ring: nicknames and forms · outer: across languages.
Nicknames & forms 2
Diminutives, pet forms, short forms and variants used alongside the name.
Across languages 1
Equivalents and cognates in other languages, plus older forms it grew from.
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