Keil & Delitzsch, on 1Chr 2:30

“And the sons of Nadab were Saled, and Apphaim. And Saled died without children.”

“Now the sons of Caleb the brother of Jerahmeel,.... Called Chelubai, Ch1 2:9 and is the same Caleb spoken of in Ch1 2:18 and his sons next reckoned were by a third wife, Azubah, Ephrath being dead, Ch1 2:19 and these sons were Mesha his firstborn, which was the father of Ziph; who gave name to the city of Ziph; there were two of this name in the tribe of Judah, Jos 15:24 or this is the title of Mesha, governor of the city of Ziph; so the Targum calls him, prince of the Ziphites: and the sons of Mareshah the father of Hebron; according to Kimchi and Ben Melech, the words are to be supplied thus, "and the sons of Ziph were Mareshah the father of Hebron"; which, though sometimes the name of a city in the tribe of Judah, is here the name of a man, from whom, perhaps, the city had its name, since Hebron is said to have sons in the next verse; Jarchi makes Mesha to be the prince of Ziph, and prince of the children of Mareshah, and prince of Hebron.”

Imported from an open dataset — not yet checked against the printed edition.