Excerpt from the Lexham Bible Dictionary, the most advanced Bible dictionary.
Brother of Ananias (or Hananiah) and son of Samaias (or Shemaiah), all characters in the deuterocanonical book of Tobit (5:13–14). In some manuscripts and translations his name is instead given as Nathan.
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JATHAN (PERSON) [Gk Iathan (Ἰαθαν)]. A son of Shemaiah and a possible kinsman of Tobit (Tob 5:14—Eng 5:13). The archangel Raphael (sent by God to help cure Tobit’s blindness) identified himself as Azarias, the son of Ananias, a relative of Tobit. Tobit, in turn, mentioned the brothers Ananias and Jathan
The International Standard Bible Encyclopedia, Revised
Tyndale Bible Dictionary
International Standard Bible Encyclopedia
The Zondervan Encyclopedia of the Bible, Volume 3, H–L
The International Standard Bible Encyclopaedia, Volumes 1–5