Middle English word ofgon comes from Old English gān, Old English of-

Detailed word origin of ofgon

Dictionary entry	Language	Definition
gān	Old English (ang)
of-	Old English (ang)	Forming verbs and adjectives with the sense of "off", "away", "from", "out of", "away from". Down. Excessively, negatively. For, for the purpose of.
ofgan	Old English (ang)	To begin, start from.. To require, demand, seek satisfaction for, exact with violence, extort; wrest.
ofgon	Middle English (enm)

Words with the same origin as ofgon