Where does “nesan” come from?

nesan (Old Dutch) comes from Proto-Germanic nesaną, from Proto-Indo-European nes- — to return home.

Ancestry of “nesan”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	nesaną	to survive, recover, heal
2	Proto-Indo-European	nes-	to return home

nesan — Etymology, Origin & Word History | Etymology Explorer