Ozem the sixth, David the seventh: David the seventh. Since it appears (1 Samuel 16:10; 1 Samuel 17:12) that Jesse had eight sons, the presumption is, from David being mentioned here as the seventh son of his father, that one of them had died at an early age, without leaving issue.
Related Commentaries of 1 Chronicles 2:15
1 Chronicles 2:15
15 Ozem the sixth, David the seventh: