Int. Standard Bible Encyclopedia IOB yob (yobh; the King James Version Job): Third son of Issachar (Genesis 46:13). In parallel passages (Numbers 26:24 1 Chronicles 7:1) the name is Jashub (yashubh), which the versions in Genesis also support as the correct form.

Multi-Version Concordance Iob (1 Occurrence) Genesis 46:13 The sons of Issachar: Tola, Puvah, Iob, and Shimron. (WEB JPS ASV NAS RSV)