Int. Standard Bible Encyclopedia IRU i'-roo (`iru): Eldest son of Caleb (1 Chronicles 4:15); probably to be read Ir, the syllable "-u" being the conjunction "and" belonging to the following word.

Multi-Version Concordance Iru (1 Occurrence) 1 Chronicles 4:15 The sons of Caleb the son of Jephunneh: Iru, Elah, and Naam; and the sons of Elah; and Kenaz. (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)