Elishama, Eliada, and Eliphelet, nine.
We had an account of David's sons, Sa2 3:2, etc., and Sa2 5:14, etc. 1. He had many sons; and no doubt wrote as he thought, Psa 127:5. Happy is the man that hath his quiver full of these arrows. 2.
Commenting on 1 Chronicles 3:1-9
nine--The number of David's sons born after his removal to Jerusalem, was eleven (Sa2 5:14), but only nine are mentioned here: two of them being omitted, either in consequence of their early deaths or because they left no issue.
Nine - There are thirteen if we count the four sons of Bath-sheba, and nine without them; and in the second book of Samuel there are eleven, reckoning the above four, and without them only seven. In the book of Samuel probably only those who were alive were reckoned, while the author of the Chronicles comprises those also who were dead in this enumeration.