Where does “lappjaz” come from?

lappjaz (Proto-Germanic) comes from Proto-Germanic lapil-, from Proto-Indo-European leb- — to hang down loosely; lip; lick.

Ancestry of “lappjaz”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	lapil-	cloth stuff, rag, scraps, flap, dewlap, lobe,...
2	Proto-Indo-European	leb-	to hang down loosely; lip; lick

lappjaz — Etymology, Origin & Word History | Etymology Explorer