John Gill Commentary 1 Chronicles 2:49

"She bare also Shaaph the father of Madmannah, Sheva the father of Machbena, and the father of Gibea; and the daughter of Caleb was Achsah." — 1 Chronicles 2:49 (ASV)

She bare also Shaaph the father of Madmannah
Prince of a place so called, in the tribe of Judah, (Joshua 15:31)

Sheva the father of Machbenah, and the father of Gibeah ;
prince of two cities of those names in the same tribe; of the latter see (Joshua 15:57) ,

and the daughter of Caleb was Achsah ;
Caleb, the son of Jephunneh, had a daughter of this name, but neither he nor she are here meant, (Joshua 15:16Joshua 15:17) but by whom Caleb, the son of Hezron, had this daughter, is not said; perhaps by Maachah his concubine last mentioned.