Ibn Ezra on Genesis 35:18/אבן עזרא על בראשית ל״ה:י״ח

1BEN-ONI. Ben-oni means the son of my mourning. Onim (mourners) in as the bread of mourners (onim) (Hos. 9:4) and be-oni (my mourning) in I have not eaten thereof in my mourning (be-oni) (Deut. 26:14) are similar.