Concerning Rehabiah: of the sons of Rehabiah, the first was Isshiah.
1 Chronicles 23:17 And the sons of Eliezer were, Rehabiah the chief. And Eliezer had none other sons; but the sons of Rehabiah were very many.
Isshiah Probably Isshiah is a contracted form, or a corruption, of Jeshaiah
1 Chronicles 26:25 And his brothers by Eliezer; Rehabiah his son, and Jeshaiah his son, and Joram his son, and Zichri his son, and Shelomith his son.