Where does “lacnius” come from?

lacnius (Old Latin) comes from Proto-Indo-European lek- — to jump, to leap; to jump, scuttle; to tear, rend.

Ancestry of “lacnius”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	lek-	to jump, to leap; to jump, scuttle; to tear, rend

lacnius — Etymology, Origin & Word History | Etymology Explorer