The surname MacTavish or McTavish is a Scottish surname, it is one Anglicised form of the Gaelic MacThàmhais,[1] i.e. son[2] of Thomas.[3][4]
Thus, MacTAVISH. G. Mac Tamhais. (G. = Gaelic Anglicized: MacTamhais (MacTavish) = Thom(p)son in English [5]