Where does “coter” come from?

coter (Old French) comes from Medieval Latin quotare, from Latin quot, from Proto-Italic *kʷot.

Ancestry of “coter”, step by step

Step	Language	Word	Meaning
1	Medieval Latin	quotare	to distinguish by numbers, number chapters
2	Latin	quot	how many; as many
3	Proto-Italic	*kʷot	—

coter — Etymology, Origin & Word History | Etymology Explorer