(i' ryoo) Personal name meaning, “donkey's colt” or “they protect.” Son of Caleb (1 Chronicles 4:15 ). Many Bible students think the original text read Ir, a copyist joining the final u to the name when it should have been the first letter of the following word, meaning, “and.”
Hastings' Dictionary of the Bible - Iru
IRU . The eldest son of Caleb ( 1 Chronicles 4:15 ). The correct name is probably Ir , the -u being simply the conjunction ‘and’ coupling it with the following name Elah.
Morrish Bible Dictionary - Iru
Son of Caleb, the son of Jephunneh. 1 Chronicles 4:15 .
Caleb - We are not informed of the particular time or manner of the death of Caleb; but by his three sons, Iru, Elah, and Naam, he had a numerous posterity, who maintained an honourable rank among their brethren