3 occurrences in 3 dictionaries
Reference: Iru
Hastings
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.
Morish
I'ru
Son of Caleb, the son of Jephunneh. 1Ch 4:15.
Smith
I'ru
(watch), the eldest son of the great Caleb son of Jephunneh.
1Ch 4:15
(B.C. 1451.)