IRU.The eldest son of Caleb (1Ch_4:15). The correct name is probably Ir, the -u being simply the conjunction and coupling it with the following name Elah.
Hastings' Dictionary of the Bible
Edited by James Hastings, D.D. Published in 1909
I'ru. (watch). The eldest son of the great Caleb, son of Jephunneh. 1Ch_4:15. (B.C. 1451).
Smith's Bible Dictionary
By Dr. William Smith.Published in 1863
ı̄?roo (עירוּ, ‛ı̄rū): Eldest son of Caleb (1Ch_4:15); probably to be read Ir, the syllable ?-u? being the conjunction ?and? belonging to the following word.
International Standard Bible Encyclopedia
PRINTER 1915.
Iru
(Hebrew Irru', עַירוּ, citizen; Sept. ᾿Ηρά, Vulg. Hir), the first-named of the sons of Caleb, the son of Jephunneh (1Ch_4:15). B.C. 1618.
CYCLOPEDIA OF BIBLICAL, THEOLOGICAL AND ECCLESIASTICAL
press 1895.