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Home › Baby Names Directory › Thomasine

Thomasine

♀ Girl

Pronounced TAH-muh-seen /ˈtɑm.ə.siːn/Medium

Meaning: Thomasine is a feminine form of Thomas, from the Aramaic te'oma, 'twin,' the name of the apostle. A medieval English feminization, it gave girls a way to honor a father or a saint named Thomas.Medium

In 30 seconds: Thomasine is the feminine of Thomas — 'twin' (said 'TAH-muh-seen'). A dignified old feminization with a small mid-century echo.
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Origin LowAramaic
MeaningThomasine is a feminine form of Thomas, from the Aramaic te'oma, 'twin,' the name of the apostle. A medieval English feminization, it gave girls a way to honor a father or a saint named Thomas.
U.S. rank (1994)#13305 ↗ Rising
1994 U.S. births6 girls (0.00% of U.S. girls)
Peak year1950
Total births (all-time)≈ 2,234

Popularity in the U.S. · SSA data

peak 195019091994

U.S. births per year (Social Security Administration, 1880–present). Pink marker = peak year.

SSA data updated May 2026. How we source & verify this data.

History & Origin

Thomasine is a feminine of Thomas, from the Aramaic for 'twin,' long borne in medieval England. It saw a quiet American echo in the early-to-mid twentieth century, peaking around 1950, always uncommon.

A Thomasine from the peak is now in her mid-seventies. The name reads as a stately heirloom feminization; the softer Tamsin has more modern appeal, but Thomasine offers a fuller, formal way to honor a Thomas.

Did you know? Thomasine dates back to medieval England as a way to pass a father's name Thomas to a daughter, a practice that also gave us Thomasina and Tamsin.
Overall data confidence 58%
References — Thomasine — Feminine of Thomas (Aramaic 'twin'); medieval English

Variations

ThomasinaTomasinaTamsin

Nicknames

TammyTamsinThomasa

Famous Bearers

  • Famous bearers coming soon.

If you like Thomasine…

Thomasina— the near-twin feminine of Thomas
Ernestine— a like formal -ine feminization of a man's name
Josephine— a like classic feminine honor-name
Celestine— a like elegant -ine vintage name

Explore names like Thomasine

By themevintageclassicsainthonorelegantfeminization

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Frequently Asked

What does the name Thomasine mean?

Thomasine is a feminine form of Thomas, from the Aramaic for 'twin.'

How do you pronounce Thomasine?

It's said TAH-muh-seen /ˈtɑm.ə.siːn/ — three syllables, stress on the first.

Is Thomasine a boy or girl name?

Thomasine is used as a girl's name, a feminine of Thomas.

How popular is Thomasine?

Thomasine was an uncommon heirloom name with a small mid-century echo, peaking around nineteen-fifty.

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