Where does “chivaler” come from?

chivaler (Middle English) comes from Anglo-Norman chevaler, from Latin caballārius, from Latin caballus, from Proto-Celtic kaballos — horse.

Ancestry of “chivaler”, step by step

Step	Language	Word	Meaning
1	Anglo-Norman	chevaler	Alternative form of chevalier
2	Latin	caballārius	—
3	Latin	caballus	horse; nag; pack-horse, jade, hack
4	Proto-Celtic	kaballos	horse

chivaler — Etymology, Origin & Word History | Etymology Explorer