Albert Barnes Commentary 1 Chronicles 2:25

"And the sons of Jerahmeel the first-born of Hezron were Ram the first-born, and Bunah, and Oren, and Ozem, Ahijah." — 1 Chronicles 2:25 (ASV)

And Ahijah — There is no “and” in the original. Hence, some would read that “the sons” were born “of” or “from Ahijah,” the first wife of Jerahmeel (see the next verse).