The descendants of Eliezer: Rehabiah was the first. Eliezer did not have any other sons, but the sons of Rehabiah were very numerous.
Here we have, I. The crown entailed, according to the divine appointment, Ch1 23:1. David made Solomon king, not to reign with him, or reign under him, but only to reign after him. This he did, 1. When he was old and full of days. He was but seventy years old when he died, and yet he was full of days, satur dierum - satisfied with living in this world.
Commenting on 1 Chronicles 23:1-23
Of the sons of Hebron,.... A third son of Kohath, Ch1 23:12, Jeriah the first, Amariah the second, Jahaziel the third, and Jekameam the fourth: of the sons of Uzziel; another son of Kohath, Ch1 23:12, Micah the first, Jesiah the second: the sons of Merari, Mahli and Mushi, Exo 6:19, the sons of Mahli, Eleazar and Kish: of whom see Ch1 24:28.
And the sons of Eliezer [were], Rehabiah the chief. And Eliezer had none other sons; but the sons of Rehabiah were very many. (c) The scripture calls him chief or first born even though he is alone and there is no one born after him, .