Ohad is not mentioned in those parallel places, because he was then dead, and that without issue. The son of a Canaanitish woman; which is here mentioned as a brand upon him, and as an intimation that the rest of them, except Judah, married to persons of a better race.
Related Commentaries of Genesis 46:10
Genesis 46:10
10 And the sons of Simeon; Jemuel,a and Jamin, and Ohad, and Jachin, and Zohar, and Shaul the son of a Canaanitish woman.