What does Genesis 46:21 mean?

Jacob's family moving into Egypt is a major milestone (Genesis 45:9–11), with long-lasting implications (Genesis 46:1–4). This part of Genesis lists all the descendants of Jacob at the time of their arrival. The record now comes to Rachel's son, Benjamin. The ten sons of Benjamin listed here may not have all been born at the time Jacob first entered Egypt since Benjamin was still considered a "boy" (Genesis 44:30–34). They may be included, however, to keep the list complete as a record of the entire first generation after Jacob, including their children.

Benjamin's sons include Bela, Becher, Ashbel, Gera, Naaman, Ehi, Rosh, Muppin, Huppin, and Ard. Becher means "young camel." Gera means "sojourner of a god." Namaan, interestingly, was the name of a false god of the day, which also means "pleasantness." Other of the names of Benjamin's sons may refer to various local gods, as well. No details are given as to why these choices were made.