Comentário sobre Números 26:39

לשפופם OF SHEFUFAM - he was identical with Muppim, but was so called also after Joseph because Joseph became enfeebled (שפוף) through his sufferings among the nations.

Being humbled among the nations. שפוף ["humble"] has the connotation of hovering [just above the ground].

לשפופם, he is identical with מופים, in Genesis 46,21.

לחופם, he is identical with חופים, in the verse just quoted. Five of Binyamin’s sons had died, i.e. בכר, גרא, נעמן, ראש and ארד. This is what Rashi had referred to on verse 13, when he wrote that 5 of Binyamin’s family were extinct.