Ezra 2:50

the children of Mehunim R.V. Meunim. These have been identified with the Maonites who oppressed the children of Israel in the days of the Judges (Judges 10:12). It is very possible that the Meunim were leagued with the Moabites and Ammonites against Jehoshaphat (2 Chronicles 20:1). Uzziah obtained the mastery over the Meunim (2 Chronicles 26:7). Very possibly it is the descendants of the Meunim whom Uzziah made prisoners, to whom the verse refers.

If this be so, the Meunim were the people of Maon, Bedouins like the Midianites, having their headquarters south of the Dead Sea, not far from Petra.

the children of Nephusim R.V. Nephisim. Both readings are found. The LXX. has Νεφουσὶμ. -Nephisim" seems the most probable, since we naturally incline to identify the name with the clan of Naphish, the Israelite or Arab mentioned in Genesis 25:15; 1 Chronicles 1:31. From another passage, 1 Chronicles 5:18-22, we learn that they with others belonged to the tribe of Hagrites (A.V. Hagarites) and experienced defeat, followed by wholesale massacre and captivity, at the hands of the Transjordanic tribes Reuben, Gad, and the half tribe of Manasseh.

In Nehemiah 7:52 they are called -Nephushesim".