Beeroth - See the marginal reference. From Joshua 9:17, it might have been expected that the population of Beeroth would be Canaanite. But from some unknown cause the Canaanite inhabitants of Beeroth had fled to Gittaim - perhaps the same as Gath - and continued there as sojourners. If this flight of the Beerothites took place at the time of Saul’s cruel attack upon the Gibeonites 2 Samuel 21:1-2, Baanah and Reehab may have been native Beerothites, and have been instigated to murder the son of Saul by a desire to avenge the blood of their countrymen. The fact of their being reckoned as Benjamites is quite compatible with their being Canaanites by blood.
Related Commentaries of 2 Samuel 4:2
2 Samuel 4:2
2 And Saul's son had two men that were captains of bands: the name of the one was Baanah, and the name of the othera Rechab, the sons of Rimmon a Beerothite, of the children of Benjamin: (for Beeroth also was reckoned to Benjamin: