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 Gen also support as the correct form.

From the International Standard Bible Encyclopedia
Edited by James Orr, published in 1939 by Wm. B. Eerdmans Publishing Co.