Smith's Bible Dictionary
O'nan. (strong). The second son of Judah, by the Canaanitess, "the daughter of Shua." Genesis 38:4; 1 Chronicles 2:3. "What he did was evil in the eyes of Jehovah and he slew him also, as he had slain his elder brother." Genesis 38:9. His death took place before the family of Jacob went down into Egypt. Genesis 46:12; Numbers 26:19. (B.C. 1706).
These files are public domain.
Smith, William, Dr. Entry for 'Onan'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/o/onan.html. 1901.