Gomer’s son and the brother of Ashkenaz and Togarmah, non-Semitic descendants of Noah through Japheth’s line (Gn 10:3). First Chronicles 1:6, a parallel passage, reads Diphath instead of Riphath, undoubtedly a latter copyist’s misspelling that was never corrected.
Riphath
From Tyndale Bible Dictionary, adapted by Mission Mutual. CC BY-SA 4.0.