Iru
Smith's Bible Dictionary 1863
(watch), the eldest son of the great Caleb son of Jephunneh. (1 Chronicles 4:15) (B.C. 1451.)
International Standard Bible Encyclopedia 1915
i'-roo (`iru): Eldest son of Caleb (1Ch 4:15); probably to be read Ir, the syllable "-u" being the conjunction "and" belonging to the following word.