Where does “larvae” come from?

larvae (English) comes from Latin larvae, from Latin larva, from Old Latin larua — demon, spirit of the dead.

Ancestry of “larvae”, step by step

Step	Language	Word	Meaning
1	Latin	larvae	nominative plural of lārva; genitive singular of...
2	Latin	larva	ghost, haunt, evil spirit, demon, devil;...
3	Old Latin	larua	demon, spirit of the dead

larvae — Etymology, Origin & Word History | Etymology Explorer