ADDAN ăd’ ən (אַדָּ֖ן, meaning unknown; the name appears as Addon, ad dōn’ in Neh 7:61). An unidentified site in Babylonia from which certain exiles returned to Jerusalem with Ezra. These were unable to produce genealogies to prove Israelite and priestly ancestry (Ezra 2:59; Neh 7:61).