The sons of Caleb, to wit, of that Caleb mentioned 1 Chronicles 2:18, as appears by comparing that verse with 1 Chronicles 2:21. And these are his sons by another and his third wife. See Poole on "1 Chronicles 2:18". Ziph; the name either of a man, or of a place, of which see Joshua 15:24,55; and then father is to be understood here, as 1 Chronicles 2:23,24. The father of Hebron; not the place so called, but a man, as is evident, because his sons here follow.
Related Commentaries of 1 Chronicles 2:42
1 Chronicles 2:42
42 Now the sons of Caleb the brother of Jerahmeel were, Mesha his firstborn, which was the father of Ziph; and the sons of Mareshah the father of Hebron.