Where does “esiba-” come from?

esiba- (Zulu) comes from Zulu a-, from Proto-Bantu à- — Class 1 subject concord.

Ancestry of “esiba-”, step by step

Step	Language	Word	Meaning
1	Zulu	a-	he, she, it; class 1 subject concord, used in the...
2	Proto-Bantu	à-	Class 1 subject concord