Girl · #11,778 in 2026

Thomasine

Name: Popularity of the name Thomasine in U.S. births, 1880–2026
Creator: U.S. Social Security Administration
License: https://www.ssa.gov/foia/
Keywords: Thomasine, baby name, popularity, U.S., SSA, rankings

Thomasina, Thomasine, or Thomasena is the feminine form of the given name Thomas, which means "twin". Thomasina is often shortened to Tamsin. Tamsin can be used as a name in itself; variants of Tamsin include Tamsyn, Tamzin, Tamsen, Tamzen, Tammi, Tamzie and Tamasin. The version "Tamsin" is especially popular in Cornwall and Wales. Along with Tamara it is the ancestor of "Tammy".

Current Rank

#11,778

Peak Rank

#1,123 (1950)

Total Babies

5-Yr Trend

Stable

1909

First Year

1994

Last Year

1950

Peak Year

#1123

Peak Rank

Total Count

Years Active

Meaning & Origin of Thomasine

What this name means, where it came from, and how it has traveled across cultures.

Source: Wikipedia (CC BY-SA 3.0). Read more →

The Story of Thomasine

Thomasine first appeared in U.S. Social Security Administration records as a baby girl name in 1909, with 5 babies given the name that year. Its peak popularity came in 1950, when 67 Thomasines were born — ranking #1,123 that year. As of 2026, Thomasine ranks #11,778 for baby girls with 6 births, with steady use. In total, more than 2K Thomasines have been born in the U.S. since records began in 1880, spanning the 1900s through the 2020s.

Popularity Over Time

Popularity by State

Top 10

11-50

51-100

101-500

500+

No data

Names that sound like Thomasine

Phonetically similar names — useful when Thomasine is the vibe but a different syllable count or letter feel might suit better. Linked entries have a profile on Peek a Name.

Thomasina
Tomasini
Tomasino
Thomason
Thymosin
Thomasson
Thomassen
Tomaino
Thomsen

Source: Datamuse . Phonetic similarity ranking, not curated.

Frequently Asked Questions about Thomasine

What does the name Thomasine mean?

How popular is Thomasine in 2026?

In 2026, Thomasine ranks #11,778 among girls' names in the U.S., with 6 babies given the name that year.

When was Thomasine most popular?

Thomasine reached its peak popularity in 1950, ranking #1,123 that year with 67 babies given the name.

In which U.S. states is Thomasine most popular?

Thomasine has historically been most popular in District of Columbia, Virginia, Maryland. Rankings vary year to year, but these states show the strongest concentration of births named Thomasine.

Is Thomasine a unisex name?

In U.S. Social Security records, Thomasine is primarily a girl's name. We don't have meaningful data for it as a boy's name.

What names go well with Thomasine?

Names that share a similar style or popularity range with Thomasine include Allean, Safa, Kinzley. These pairings are based on rank proximity and naming era in U.S. data.

About the name Thomasine

Thomasine is a girl baby name tracked by the U.S. Social Security Administration. It first appeared in SSA records in 1909 and has accumulated 2K births in the dataset. Thomasine's peak popularity came in 1950 when it ranked #1,123. Use the chart and map above to compare Thomasine's trajectory across years and U.S. states, or browse the related names section to discover similar choices.

Continue exploring

Data sources

Birth statistics (counts, ranks, years 1880–2026) — U.S. Social Security Administration . Predictions for years not yet released by SSA are computed by Peek a Name from historical trends; we update with official data as soon as it ships.
Etymology, cultural origins, and related forms — Behind the Name (used under their public API terms).
Meaning prose and editorial summary — Wikipedia article extracts, licensed under CC BY-SA 3.0 .
Predicted nationality distribution — Nationalize.io .
Phonetically similar names — Datamuse .

Peek a Name aggregates and presents the above data for informational purposes. Statistical predictions and external attributions are clearly labelled where shown; we make no guarantee of accuracy beyond what each source provides.