Charles Ellicott Commentary 1 Chronicles 27:18

"of Judah, Elihu, one of the brethren of David: of Issachar, Omri the son of Michael:" — 1 Chronicles 27:18 (ASV)

Of Judah, Elihu, one of the brothers of David. —The Septuagint reads “Eliab.” Eliab was David’s eldest brother (1 Chronicles 2:13). He, therefore, was tribal prince by right of the firstborn, assuming that the house of Jesse was the leading family of Judah. (See Ruth 4:17-20.)

Omri the son of Michael. —Omri was, perhaps, an ancestor of the successful adventurer who founded the dynasty of Ahab (1 Kings 16:16; Micah 6:16).