Where does “Cormac” come from?

Cormac (Irish) comes from Old Irish Cormac, from Old Irish mac, from Proto-Celtic makkos — surety.

Ancestry of “Cormac”, step by step

StepLanguageWordMeaning
1Old IrishCormac—
2Old Irishmacbond, surety
3Proto-Celticmakkossurety
Every word from Proto-Celtic makkos →Every word from Old Irish mac →Every word from Old Irish Cormac →