Where does “Kormákur” come from?

Kormákur (Icelandic) comes from Old Norse Kormákr, from Old Irish Cormac, from Old Irish mac, from Proto-Celtic makkos.

Ancestry of “Kormákur”, step by step

Step	Language	Word	Meaning
1	Old Norse	Kormákr	—
2	Old Irish	Cormac	—
3	Old Irish	mac	bond, surety
4	Proto-Celtic	makkos	—

Kormákur — Etymology, Origin & Word History | Etymology Explorer