Where does “gren” come from?

gren (Swedish) comes from Old Norse grein, from Proto-Germanic grainō.

gren (Swedish): branch; event; sub-event within a sport

Definitions

Step	Language	Word	Meaning
1	Old Norse	grein	branch; point, head, part; cause, reason
2	Proto-Germanic	grainō	—

gren — Etymology, Origin & Word History | Etymology Explorer