Where does “forthgan” come from?

forthgan (Middle English) comes from Old English forþgān, from Proto-Germanic gāną, from Proto-Indo-European ǵʰengʰ- — to walk; to step.

Ancestry of “forthgan”, step by step

Step	Language	Word	Meaning
1	Old English	forþgān	to go forth, advance, proceed, pass by, go away,...
2	Proto-Germanic	gāną	to go, walk
3	Proto-Indo-European	ǵʰengʰ-	to walk; to step

forthgan — Etymology, Origin & Word History | Etymology Explorer