Girl · #9,998 in 2026

Tamsin

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
#9,998
Peak Rank
#4,467 (2017)
Total Babies
419
5-Yr Trend
-56%
1955
First Year
2025
Last Year
2017
Peak Year
#4467
Peak Rank
419
Total Count
41
Years Active

Meaning & Origin of Tamsin

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

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".

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

The Story of Tamsin

Tamsin first appeared in U.S. Social Security Administration records as a baby girl name in 1955, with 5 babies given the name that year. Its peak popularity came in 2017, when 27 Tamsins were born — ranking #4,921 that year. As of 2026, Tamsin ranks #9,998 for baby girls with 6 births, falling sharply (-56%). In total, more than 419 Tamsins have been born in the U.S. since records began in 1880, spanning the 1950s through the 2020s.

Popularity Over Time

Popularity by State

ME
WA
MT
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MI
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VT
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MA
OR
ID
SD
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IL
IN
OH
PA
NJ
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RI
CA
NV
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NE
MO
KY
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MD
DE
DC
UT
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AR
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Top 10
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500+
No data

Names that sound like Tamsin

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

Source: Datamuse . Phonetic similarity ranking, not curated.

Frequently Asked Questions about Tamsin

What does the name Tamsin mean?
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".
How popular is Tamsin in 2026?
In 2026, Tamsin ranks #9,998 among girls' names in the U.S., with 6 babies given the name that year.
When was Tamsin most popular?
Tamsin reached its peak popularity in 2017, ranking #4,467 that year with 27 babies given the name.
Is Tamsin a unisex name?
In U.S. Social Security records, Tamsin is primarily a girl's name. We don't have meaningful data for it as a boy's name.
What names go well with Tamsin?
Names that share a similar style or popularity range with Tamsin include Maleta, Catheline, Louvella. These pairings are based on rank proximity and naming era in U.S. data.

Similar Names

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Maleta
Peak #4467
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Catheline
Peak #4467
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Louvella
Peak #4467
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Phyillis
Peak #4467
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Cosetta
Peak #4467
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Pasty
Peak #4467
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Mablene
Peak #4467
👧
Charlann
Peak #4467

About the name Tamsin

Tamsin is a girl baby name tracked by the U.S. Social Security Administration. It first appeared in SSA records in 1955 and has accumulated 419 births in the dataset. Tamsin's peak popularity came in 2017 when it ranked #4,467. Use the chart and map above to compare Tamsin'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.