Tamsin \t(a)-msin, tam-sin\ as a girl's name is pronounced TAM-sin. It is of English origin. Short form of Thomasina (Aramaic) "twin". See also Tammy.
Tamsin has 8 variant forms: Tamasin, Tamasine, Tamsen, Tamsine, Tamsinne, Tamsyn, Tamzen and Tamzin.
For more information, see also the related name Tasmine.
Baby names that sound like Tamsin are Tomasine, Tomasina and Thomasin.