וַיִּהְי֥וּ בְנֵי־בֶ֖לַע אַ֣רְדְּ וְנַעֲמָ֑ן מִשְׁפַּ֙חַת֙ הָֽאַרְדִּ֔י לְנַֽעֲמָ֔ן מִשְׁפַּ֖חַת הַֽנַּעֲמִֽי׃
And the sons of Bela were Ard and Naaman; [of Ard,] the family of the Ardites; of Naaman, the family of the Naamites.
Read midrashic interpretation of Numbers 26:40: and classical rabbinic exegesis.