Boyd’s Bible Dictionary:
(serpent). A grandson of Benjamin (1 Chron. 8:5). Shupham (Num. 26:39). Shuppim (1 Chron. 7:12,15). Muppim (Gen. 46:21).
Concise Bible Dictionary:
Son or descendant of Benjamin (1 Chron. 8:5). Supposed to be the same as SHUPHAM in Numbers 26:39 and MUPPIM in Genesis 46:21.
Jackson’s Dictionary of Scripture Proper Names:
their sinuosity: their bareness