Tamsin is a feminine name of British origin. A derivative of Thomasina and the female form of Thomas, Tamsin means "twin" in English. It is a popular girl's name in Great Britain, especially throughout Cornwall and Wales. The name has various spellings, including Tamzin and Tamsen. Literary fans may recognize the name from Peter S. Beagle's fantasy novel Tamsin which made its mark in the late 20th century. With such multi-faceted sentiments, Tamsin allows you to call baby after a fictional character or honor a loved one from past generations.
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