Where does “Svend” come from?

Svend (Norwegian) comes from Danish Svend, from Old Norse sveinn, from Proto-Germanic swainaz, from Proto-Indo-European swé — self.

Ancestry of “Svend”, step by step

Step	Language	Word	Meaning
1	Danish	Svend	a man, especially a young, vigorous one
2	Old Norse	sveinn	boy, lad; servant, lackey
3	Proto-Germanic	swainaz	relative; kinsman; young man; herder; herdsman,...
4	Proto-Indo-European	swé	self