Where does “handla” come from?

handla (Old Norse) comes from Proto-Germanic handlōną, from Proto-Germanic handuz — hand.

Ancestry of “handla”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	handlōną	to take or hold in the hand, seize, grip
2	Proto-Germanic	handuz	hand

handla — Etymology, Origin & Word History | Etymology Explorer