Tamsyn

Girls' name

Twin, through Tamsin

Tamsyn has been given to 180 babies in the U.S. since 1976. It was used fewer than 5 times in 2025, so it doesn't appear in the latest year's list — today it's a genuinely uncommon pick. Its peak year was 2016, with 15 recorded.

Babies named Tamsyn, 2024

1 in 669,000

Tamsyn over time, 1880–2025

Girls

Based on births in the U.S. Babies given the name each year. Hover the chart — or focus it and use the arrow keys — for any year. Gaps mean the name was given fewer than 5 times that year; these counts are unpublished.

Tamsyn: meaning, origin, and history

Twin, through Tamsin

Deeper origin not confirmed in the cited records

What Tamsyn means

Tamsyn belongs to the name family reached through Tamsyn → Tamsin → Thomasina → Thomas. Its meaning is “twin”.

Origin, language, and formation

Tamsyn is used in English.

Related names and everyday forms

Related names include Tamsin, Thomasina and Thomas.

American usage and historical context

In the United States, 180 girls were recorded with the name Tamsyn between 1976 and 2024. Its highest annual count was 15 in 2016; its best national rank was #5,066 in 1979.

Sources & methodologyReferences, data & attribution

Meaning, origin, and language notes draw on the references below.

American popularity figures use published Social Security Administration records for this exact spelling. Counts below five for a name, sex, and year are omitted.

Wiktionary material is available under CC BY-SA 4.0.

How common is Tamsyn?

Tamsyn had fewer than 5 recorded uses in 2025, so these figures use 2024, the last year it was published.

Among all babies, 2024: 1 in 669,000; 5 of 3,342,801 births
Among girls only: 1 in 324,000; <0.01% of girls
Rank, 2024: Unranked; Fewer than 5 uses
Coin-flip room size: 463,412 kids; Even odds of a second one

Where Tamsyn sits on the popularity scale

Rarest published (5 a year)#1 — Olivia (13,544)

Chance at least one other child shares the name

If the other children were drawn at random from the 2024 national name distribution. Real classrooms cluster by region and community, so treat these as a floor, not a ceiling.

Class of 20Under 1%

Class of 30Under 1%

Grade of 100Under 1%

School of 500Under 1%

Put another way: gather 463,412 children born in 2024 and it's an even bet that one of them is another Tamsyn. In a class of 30 the chance is Under 1%.

When Tamsyns were born

Half of everyone ever recorded as Tamsyn was born before 2012 — so the typical Tamsyn is around 13 today.

Median birth year: 2012; About 13 years old
Biggest decade: 2010s; 38.3% of all use
Born in the last 25 years: 62.2%; A modern name
Recorded since 1950: 180; People you could plausibly meet

Choose a decade

2010s — 38.3% of all recorded uses (69).

Is Tamsyn rising or falling?

Rank movement and count movement can disagree — the number of distinct names in use keeps growing, so a name holding a steady count still slides down the list. Both are shown.

Rank vs 1 year ago: —; Not ranked then
Rank vs 5 years ago: New entry; Not ranked then
Rank vs 10 years ago: —; Not ranked then
Births vs 10 years ago: —; Not published both years
Share of its own peak: 0%; Peak was 2016 (15)
Years since peak: 9; Years
Year-to-year steadiness: Volatile; 30.2% average annual change
Best rank ever: #5,066; 1979

Spellings of Tamsyn

Tamsyn is not the most common spelling — Tammy is, with 74.0% against Tamsyn's 0.04%.

Tammy74.0%332,015
Camryn6.9%30,959
Taryn5.7%25,698
Kamryn5.5%24,809
Karsyn2.1%9,369
Carsyn0.99%4,431
Camdyn0.64%2,860
Tamya0.62%2,790

Grouped by closeness of spelling (up to two letter changes), same sex, with a floor on all-time use. It catches Sophia/Sofia and Aiden/Ayden, and misses spellings that sound alike but look different, like Sean and Shawn.

Tamsyn around the world

Where Tamsyn ranks in official birth records elsewhere in the world. Rankings only — the number of births isn’t comparable between places, so it isn’t shown.

England & Wales
1996–2024
#5,892
in 2024
Scotland
1994–1998
#664
in 1998
South Australia
1958–2013
#536
in 2013

Popularity data from Office for National Statistics, National Records of Scotland and Consumer and Business Services (South Australia). ONS, NRS data under Open Government Licence v3.0. CBS SA data under CC BY 4.0.

Tamsyn by the numbers

The raw record for each sex the name is used for.

As a girl's name

Rank in 2025: Unranked
Trend vs 5 yrs ago: —
Best rank ever: #5,066; 1979
Peak year: 2016; 15 that year
First recorded: 1976
Last recorded: 2024
All-time count: 180
Count in 2025: Under 5

Names similar to Tamsyn

Matched on shared beginnings and endings, similar length, and comparable popularity.

Tamani Tamzin Lawsyn Tamaka Tameya Tamura Tamula Jaxsyn Tamari Tameia Tamber Tamlyn Tamrah Kaisyn Tamyka Tamina Tamkia Tameko Paisyn Chosyn Tamyia Tamana Tammee Tamico

Sibling names for Tamsyn

Names from the same era and popularity tier — the two things that make a sibling set feel deliberate — skipping lookalike spellings and shared initials.

For a sister

Karleigh Hadlee Heavenly Scarlette Ayesha Henley Annalee Raylee

For a brother

Smith Damari Kye Canaan Vladimir Cayson Hamilton Kingsley

Explore around Tamsyn

Top names of 2016, Tamsyn's peak year The 2010s in full Other names that peaked in 1979 Girls' names starting with T