NameCensus.

UK girl's name

Thomasin

A feminine form of the name Thomas, derived from the Aramaic meaning "twin".

For 2026, the newest official UK baby-name figures on this page are from 2023. That release is the current official benchmark rather than a forecast.

Thomasin is a girl's name in the UK records. People looking for Thomasin popularity in 2026 should use the latest official release, which is 2023 in this profile. In that release it ranked #5687, with 3 babies registered with the name. Its strongest year in the published records was 2022, with 5 births.

This profile covers 18 England and Wales registrations across 5 recorded years from 1998 to 2023. The figures come from ONS England and Wales, so the page is a view of published baby-name registrations rather than a forecast or a live count of people using the name today.

The latest count is about 60% of the recorded peak, which gives a quick read on how the name has moved since its high point.

We estimate that about 18 living people in the UK are called Thomasin. This uses published birth registrations from England and Wales, Scotland and Northern Ireland, then applies ONS national life tables to estimate how many are likely still alive. It does not forecast extra births for 2024 or 2026.

Key insights

  • Thomasin ranked #5687 for girls in England and Wales in 2023, with 3 registrations.
  • The name peaked in 2022, when 5 girls were registered as Thomasin.
  • About 18 living people in the UK are estimated to have Thomasin as a first name, after adjusting past birth registrations with ONS life tables.

Latest rank (E&W)

#5687

2023

Births in 2023

3

Latest year

Peak year

2022

5 births

Estimated living

18

2026

Meaning

What does Thomasin mean?

The name Thomasin is a feminine form of the English name Thomas, which itself derives from the Aramaic name Toma meaning "twin". The name Thomas was popularized by the apostle Thomas, one of the twelve disciples of Jesus Christ. Thomas was also known as Didymus, which is the Greek word for "twin".

Thomasin emerged as a feminine variant of Thomas in medieval England, particularly during the 12th to 14th centuries. It is considered an English name, though its origins can be traced back to the Aramaic language spoken in ancient Judea. The variant spellings Thomasine and Thomasina were also used during this period.

One of the earliest recorded examples of the name Thomasin is found in the Canterbury Tales by Geoffrey Chaucer, written in the late 14th century. In the "Tale of the Wyf of Bathe", Chaucer mentions a character named Thomasine. This suggests that the name was in use in medieval England during Chaucer's time.

Throughout history, there have been several notable individuals who bore the name Thomasin. One of the earliest was Thomasine Percyvell (c. 1370 - c. 1437), an English mystic and visionary who wrote spiritual treatises and was considered a holy woman during her lifetime.

Another historical figure was Thomasine von Zirkitz (c. 1504 - 1574), a German noblewoman and writer who authored the first known German-language cookbook, "Ein Sehr Künstliches und Nutzliches Kochbuch" (A Very Artistic and Useful Cookbook), published in 1570.

In the 17th century, Thomasine Christine Gyllembourg (1617 - 1677) was a Danish noble and landowner who played an influential role in the development of agriculture and land management in Denmark.

During the 18th century, Thomasine Ritchie (1744 - 1826) was a Scottish poet and songwriter who composed several popular ballads and songs, including "The Flowers of the Forest" and "The Bonny Broom".

In the 19th century, Thomasine Christine Gyllembourg-Ehrensvärd (1773 - 1856), a Danish novelist and playwright, was a prominent figure in the Golden Age of Danish literature and authored several influential works, including the novel "Rodzinka" (1824).

Sourced from namecensus.com.

Popularity

Thomasin over time

The chart below shows babies named Thomasin registered in England and Wales in the years where the name appears in the published records, from 1998 to 2023. Empty years are left out so rare names are not stretched across long periods where the published files do not show any registrations.

For Thomasin, the clearest high point is 2022. The latest England and Wales figure is 3 births in 2023, compared with 5 at the peak.

Babies born per year

Thomasin
01345199820102023

Decades

Thomasin by decade

Decade totals smooth out the yearly jumps and make it easier to see whether Thomasin was a short-lived spike or a name that stayed in regular use. Average rank is calculated only from years where a published rank exists.

Decade Average rank Total births Years covered
2020s #4829 8 2
2010s #5666 3 1
1990s #3537 7 2

Related

Names similar to Thomasin

FAQ

Thomasin: questions and answers

How popular is the name Thomasin in the UK right now?

In 2023, Thomasin was ranked #5687 for girls in England and Wales, with 3 births registered.

When was Thomasin most popular?

The peak year on record was 2022, with 5 babies registered as Thomasin in England and Wales.

What is the meaning and origin of Thomasin?

A feminine form of the name Thomas, derived from the Aramaic meaning "twin".

How many people are called Thomasin in the UK?

A total of 18 babies have been registered as Thomasin across the 5 years of ONS England & Wales records shown here.

Which records is this page based on?

The England and Wales timeline uses ONS baby-name records. Scotland figures come from NRS and Northern Ireland figures come from NISRA. Counts are registrations in published baby-name files. The living estimate uses those birth registrations with ONS national life tables.