According to the commandment of the Lord to Joshua, he gave to Caleb the son of Jephunneh a portion among the people of Judah, Kiriath-arba, that is, Hebron (Arba was the father of Anak). - Joshua 15:13
AKA Hebron
Probably means "Four Cities." Maybe the city was divided into four quarters. Maybe because of the four patriarchs who are buried there. Joshua 15:13 says it's because it is called after Arba, the father of Anak.
(https://bibleatlas.org/kiriath-arba.htm)