The Hebrew name Achiyahu (H118) is a variant of Ahijah (H281), meaning "brother of Yahweh" or "my brother is Yahweh." It is a compound of ach (H251, brother) and Yahu (a shortened form of YHWH).
Several individuals bear this name in the Old Testament, including a son of Jerahmeel (1 Chronicles 2:25), reflecting the Hebrew practice of God-honoring name-giving.
Names compounded with divine titles were common in ancient Israel as confessions of faith — parents expressing their covenant identity through the names they gave their children. The prefix achi- ("my brother") applied to God points to an intimate, familial relationship with Yahweh.
This concept is fulfilled in Christ, who "is not ashamed to call them brothers" (Hebrews 2:11). The name Achiyahu anticipated the incarnation's relational breakthrough — God becoming our brother in Jesus Christ.