Smith's Bible Dictionary (1863)
(serpent), a Benjamite, and one of the fourteen descendants of Rachael who belonged to the original colony of the sons of Jacob in Egypt. (Genesis 46:21) (B.C. 1706.) In (Numbers 26:39) the name is given as Shupham.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
MUP'PIM (serpent ?), a descendant of Benjamin, Gen 46:21; called Shupham in Num 26:39.
Hitchcock's Bible Names (1869)
out of the mouth; covering