Where does “вчера” come from?

вчера (Macedonian) comes from Proto-Slavic vьčera, from Proto-Slavic večerъ, from Proto-Balto-Slavic wékeras, from Proto-Indo-European wekʷsperos.

вчера (Macedonian): yesterday

Definitions

Step	Language	Word	Meaning
1	Proto-Slavic	vьčera	yesterday
2	Proto-Slavic	večerъ	evening
3	Proto-Balto-Slavic	wékeras	evening
4	Proto-Indo-European	wekʷsperos	—

вчера — Etymology, Origin & Word History | Etymology Explorer