Where does “contra” come from?

contra (Old Italian) comes from Latin contrā, from Latin ubī, from Latin cubī, from Proto-Italic *kʷuðei — where.

Ancestry of “contra”, step by step

Step	Language	Word	Meaning
1	Latin	contrā	against
2	Latin	ubī	where? in what place?, in which place?
3	Latin	cubī	—
4	Proto-Italic	*kʷuðei	where