Komentarz do Diwrej ha-jamim I 1:6

Ashkenaz and Diphath (with a “daleth”), but in the Pentateuch it is written (Gen. 10:3): “... and Riphath,” because in the beginning they were weak (רָפִים), and they did not overpower Israel, but at the end they were filled with disgrace (דֹּפִי) and evil.