I Chronicles 8:3 Midrash

וַיִּהְי֥וּ בָנִ֖ים לְבָ֑לַע אַדָּ֥ר וְגֵרָ֖א וַאֲבִיהֽוּד׃

And Bela had sons, Addar, and Gera, and Abihud;