Iru appears in the genealogical records of Judah's tribe as part of Caleb's family line. The Septuagint renders the name as 'Era' or 'Ira,' showing the slight variations common in ancient name transmission. First Chronicles preserves many family records that help trace the development of Judah's clans, and Iru represents one individual in these complex genealogical networks. These brief mentions remind us that Israel's tribal structure consisted of real families with histories extending across generations.