See also the related category aramaic.
Thomasyn is not often used as a baby girl name. It is not in the top 1000 names.
Baby names that sound like Thomasyn include Thomasyne, Taimany, Tamany, Tamasin (English), Tamasine, Tammanee, Tammany, Thomasin (English), Thomasine (English), Thomason, Thomassine, Thomazine, Tomasin (English), Tomasine, Thomasina (English), Tomasina (English and Italian), Tamsin (English), Tamsyn (English), Tamzen (English), and Tamzin (English).
† approx English pronunciation for Thomasyn: TH as in "theme (TH.IY.M)" ; AA as in "odd (AA.D)" ; M as in "me (M.IY)" ; AH as in "mud (M.AH.D)" ; S as in "see (S.IY)" ; IH as in "it (IH.T)" ; N as in "knee (N.IY)"