Where does “quota” come from?

quota (Late Latin) comes from Latin quotus, from Latin quot, from Proto-Italic *kʷot.

Ancestry of “quota”, step by step

Step	Language	Word	Meaning
1	Latin	quotus	which? (in numerical sequence); what number?
2	Latin	quot	how many; as many
3	Proto-Italic	*kʷot	—