Where does “Cesar” come from?

Cesar comes from Spanish César, from Latin Caesar, from Latin caesaries meaning "hair," ultimately from Proto-Indo-European kéysero-.

Ancestry of “Cesar”, step by step

Step	Language	Word	Meaning
1	Spanish	César	—
2	Latin	Caesar	Julius Caesar; emperor
3	Latin	caesaries	or hair
4	Proto-Indo-European	kéysero-	hair

Cesar — Etymology, Origin & Word History | Etymology Explorer