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".
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People named Thomasina (and variants)
Tammi
Tammi Patterson (born 1990), Australian tennis player
Tammi Terrell (1945–1970), American recording artist
Tammie
Tammie Jo Shults (born 1961), American commercial airline captain, author, and retired naval aviator
Tamsen
Tamsen Donner (1801–1847), third wife of George Donner of the Donner Party
Tamsen Fadal (born 1970), American journalist, news anchor, author and host/executive producer
Tamsen McGarry (born 1982), Irish alpine skier
Emil Tamsen (1862–1957), South African philatelist
Tamsin
Tamsin Blanchard, British fashion journalist
Tamsin Carroll (born 1979), Australian actress
Tamsin Cook (born 1998), Australian swimmer
Tamsin Dunwoody (born 1958), sometimes known as Tamsin Dunwoody-Kneafsey, British politician
Tamsin Edwards, British climate scientist
Tamsin Egerton (born 1988), British actress
Tamsin Ford (born 1966), British psychiatrist specialising in children's mental health
Tamsin Greenway (born 1982), English netball player
Tamsin Greig (born 1966), British actress
Tamsin Heatley, British actress and voice artist
Tamsin Hinchley (born 1980), Australian volleyball player
Tamsin Mather (born 1976), British Professor of Earth Sciences
Tamsin Pickeral (born 1971), British author and art historian
Tamsin West (born 1974), Australian actress and singer
Tamsyn
Tamsyn Challenger, Cornish artist
Dame Tamsyn Imison (1937–2017), British educator
Tamsyn Leevey (born 1978) New Zealand squash player
Tamsyn Manou (born 1978), Australian athlete and middle-distance runner
Tamsyn Muir, New Zealand author of fantasy, science fiction and horror genres
Oona Tamsyn King, Baroness King of Bow (born 1967), British Labour politician
Tamzin
Tamzin Malleson (born 1974), British actress
Tamzin Merchant (born 1987), British actress
Tamzin Outhwaite (born 1970), British actress
Tamzin Thomas (born 1997), South African sprinter
Thomasin
Thomasin von Zirclaere or Tommasino Di Cerclaria (c.1186–c.1235), Italian Middle High German lyric poet.
Thomasin McKenzie (born 2000), New Zealand actress
Thomasina
Thomasina Jordan (?–1999), American Indian activist who became the first American Indian to serve in the United States Electoral College
Thomasina Miers (born 1976), British chef
Thomasina Pidgeon (born 1975), Canadian rock climber
Thomasina Winslow (1965–2023), American blues musician
Thomazina Muliercula (died 1603), English jester at the court of Elizabeth I
Thomasine
Thomasine Christine Gyllembourg-Ehrensvärd (1773–1856), Danish author
Thomasine, Lady Percival (c. 1470–c. 1530), Cornish benefactress
Thomas(ine) Hall (c. 1603–after 1629), an intersex individual in British America
Margrethe Marie Thomasine Numsen (1705–1776), Danish courtier
Fictional Thomasinas
Beatrix Potter's Thomasina Tittlemouse
Tamsin Yeobright from The Return of the Native by Thomas Hardy. Her name is given alternately as Tamsin or Thomasin throughout the book
Thomasina, the feline heroine of the 1957 book Thomasina: The Cat Who Thought She Was God by Paul Gallico and The Three Lives of Thomasina, a 1964 Disney film based on the book
Thomasina, a character in Tom Stoppard's Arcadia
Thomasina, a character in the television series Kings
"Thomasina", a song by The Besnard Lakes
Tamsin, a character in the television series Lost Girl
Thomasin, a character in Robert Eggers' 2015 film The Witch
Tamasin Reedbourne, a character in C. J. Sansom's Shardlake book series
Thomasina Tuckerton, a character in Agatha Christie's The Pale Horse
Similar names
Thomas
Tammy
Tamara
Tamar
Tasmin
Tazmin