Where does “jenže” come from?

jenže (Czech) comes from Czech že, from Old Czech že, from Proto-Slavic je že.

jenže (Czech): but

Definitions

Step	Language	Word	Meaning
1	Czech	že	that; right; isn't it, aren't we, can we, don't...
2	Old Czech	že	—
3	Proto-Slavic	je že	—

jenže — Etymology, Origin & Word History | Etymology Explorer