Easton's Bible Dictionary (1897)
Strong, the second son of Judah (Gen. 38:4-10; comp. Deut. 25:5; Matt. 22:24). He died before the going down of Jacob and his family into Egypt.
Smith's Bible Dictionary (1863)
(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.)
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
O'NAN (strong), the second son of Judah, Gen 38:4; 1 Chr 2:3, who refused to raise up seed to his elder brother after his death. Gen 38:8-9. He died before the migration of Jacob's family to Egypt. Gen 46:12; Num 26:19.