Twin
Tamsin is a contracted form of Thomasina, the feminine version of the name Thomas. It originated as a medieval English short form and has long been popular in Cornwall, England. While Thomas has biblical roots, Tamsin itself is a distinct secular evolution.
Fewer than 5 girls were named Tamsin in 2025.
US births per 5-year period, 1990–present (SSA data).
Olivier Award-winning British actress
English actress and model
A character in the series The Expanse · The Expanse
A dark valkyrie character in the TV series Lost Girl · Lost Girl
