Albert Barnes Commentary 2 Samuel 3:4

"and the fourth, Adonijah the son of Haggith; and the fifth, Shephatiah the son of Abital;" — 2 Samuel 3:4 (ASV)

Adonijah - The same person who, when David was dying, aspired to the crown and was put to death by Solomon.

Shephatiah - Meaning “God is judge.” This is the same name as Jehoshaphat, only with the two elements that compose it placed in reverse order. Nothing more is known of him or his brother Ithream.