Where does “четꙑре” come from?

четꙑре (Old East Slavic) comes from Proto-Slavic *četỳre, from Proto-Balto-Slavic ketures, from Proto-Indo-European kʷetwóres, from Proto-Indo-European kʷe- — and.

Ancestry of “четꙑре”, step by step

Step	Language	Word	Meaning
1	Proto-Slavic	*četỳre	—
2	Proto-Balto-Slavic	ketures	—
3	Proto-Indo-European	kʷetwóres	four
4	Proto-Indo-European	kʷe-	and

Every word from Proto-Indo-European kʷe- →

четꙑре — Etymology, Origin & Word History | Etymology Explorer