Where does “kalzaz” come from?

kalzaz (Proto-Germanic) comes from Proto-Indo-European gols-, from Proto-Indo-European gels- — voice, cry; to call; voice, cry; to call.

Ancestry of “kalzaz”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	gols-	—
2	Proto-Indo-European	gels-	voice, cry; to call; voice, cry; to call

kalzaz — Etymology, Origin & Word History | Etymology Explorer