Mac Raith (Scottish Gaelic) comes from Scottish Gaelic mac, from Middle Irish mac, from Old Irish macc, from Primitive Irish ᚋᚐᚊᚊᚔ, from Proto-Celtic makkʷos, from Proto-Indo-European meh₂ḱ- — to raise, increase; long.
Ancestry of “Mac Raith”, step by step
Mac Raith traces back through two separate lines of ancestry.