Albert Barnes Commentary 1 Kings 4:13

"Ben-geber, in Ramoth-gilead (to him [pertained] the towns of Jair the son of Manasseh, which are in Gilead; [even] to him [pertained] the region of Argob, which is in Bashan, threescore great cities with walls and brazen bars);" — 1 Kings 4:13 (ASV)

It is worth noting that five of the twelve prefects are designated solely by their father’s names, such as Ben-Hur, while one (Ahimaaz, 1 Kings 4:15) has no such designation.

The document that the author of the Book of Kings consulted probably contained the proper name and father’s name of each prefect originally. However, it was likely damaged or illegible in places by the time the author consulted it. If the document was in the form of a list, a single damaged area at one corner might have removed four of the six missing names.