Where does “speking” come from?

speking (Middle English) comes from Norwegian Bokmål -ing, from Old Norse -ing, from Proto-Germanic -ingō — -ing.

Ancestry of “speking”, step by step

Step	Language	Word	Meaning
1	Norwegian Bokmål	-ing	Used to form verbal nouns from verbs; -ing; Used...
2	Old Norse	-ing	Forms gerund nouns from verbs
3	Proto-Germanic	-ingō	-ing