The Hebrew place name Addan (H135) appears in Ezra 2:59 as one of the Babylonian settlements from which Jewish exiles returned to Jerusalem but could not prove their Israelite ancestry. The parallel passage in Nehemiah 7:61 uses the variant Addon (H114).
The exact location is unknown — it was a Babylonian town where Jewish exiles lived during the captivity.
The mention of Addan in the post-exilic return lists highlights a pastoral concern: genealogical uncertainty was not just an administrative matter but a spiritual one. Those who could not verify their lineage faced questions about priestly eligibility and covenant membership.
This difficulty foreshadows the transformation of the New Covenant, where spiritual rebirth — not ethnic descent — establishes covenant identity: "Yet to all who did receive him, to those who believed in his name, he gave the right to become children of God — children born not of natural descent, nor of human decision or a husband's will, but born of God" (John 1:12-13).