Where does “fandiand” come from?

fandiand (Old Frisian) comes from Proto-Germanic fandōną, from Proto-Indo-European pent- — to pass; path.

Ancestry of “fandiand”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	fandōną	to seek, search for, examine
2	Proto-Indo-European	pent-	to pass; path

fandiand — Etymology, Origin & Word History | Etymology Explorer