Jamieson, Fausset & Brown, on 1Chr 4:14

“Maonathi beget Ophra, and Saraia begot Joab the father of the Valley of artificers: for artificers were there.”

“Joab, the father of the valley of Carashim--literally, "the father of the inhabitants of the valley"--"the valley of craftsmen," as the word denotes. They dwelt together, according to a custom which, independently of any law, extensively prevails in Eastern countries for persons of the same trade to inhabit the same street or the same quarter, and to follow the same occupation from father to son, through many generations. Their occupation was probably that of carpenters, and the valley where they lived seems to have been in the neighborhood of Jerusalem (Neh 11:35).”

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