mag.di.el is a proper name listed among the chiefs of Edom.

The attested form is used as a proper name in lists identifying a chief of Edom.

1. Proper name of an Edomite chief · dominant

   In Genesis 36:43, the proper-noun form occurs in the list introduced by “Chief,” and the APB renders the clause “Chief Magdiel, chief Iram.” In 1 Chronicles 1:54, the same proper-noun form appears in a corresponding list of “the chiefs of Edom,” with the APB again rendering “chief Magdiel, chief Iram.”

   Genesis 36:431 Chronicles 1:54

In the Anselm Project Bible: Across both cited verses, the APB presents the name in the phrase “chief Magdiel.” The verse is read as a whole, but both clauses place it within a list of Edomite chiefs.