Meaning and Name Origin
Thomasina \th(o)-masi-na, thom(a)-sina\ as a girls' name is pronounced TAH-ma-SEE-nah. It is of Aramaic origin, and the meaning of Thomasina is "twin". Feminine of Thomas. Thomasin was the earliest form, followed by Thomasina in the Victorian era, and Tamsin a century later. The original Greek form of this name, Didymos, began as a nickname for one of the twelve disciples of Jesus in the Christian scriptures. See also Tamsyn and Tammy.
Thomasina has 1 masculine form: Tamson.
Thomasina is a very popular first name for women (#1839 out of 4276, Top 43%) but a rare last name for all people. (2000 U.S. Census)
Below is a graphed comparison of the popularity of the girl name Thomasina and associated names. Popular related forms of Thomasina (#unlisted) ranked in the Top 1000 are Thomas, Tommie, Tammy, Tammie, Tamie, Tammi and Tami. Usage of these girl names was at its apex during 1960-1969 and is now much lower, with versions like Thomas, Tommie, Tammy, Tammie and Tammi falling out of fashion. (2014 Birth Statistics)