I Chronicles 1:54 Midrash

אַלּ֥וּף מַגְדִּיאֵ֖ל אַלּ֣וּף עִירָ֑ם אֵ֖לֶּה אַלּוּפֵ֥י אֱדֽוֹם׃ (פ)

the chief of Magdiel, the chief of Iram. These are the chiefs of Edom.

Read midrashic interpretation of I Chronicles 1:54: and classical rabbinic exegesis.