du.mah is used as a proper name in genealogical lists, a territorial list, and an oracle heading.

The attested forms function as a proper name: in lists of names and places and in the heading of an oracle. The supplied verses do not establish whether every occurrence identifies the same referent.

1. Proper name in lists and oracle heading · dominant

   All four occurrences are tagged Noun · Proper. In Genesis 25:14 and 1 Chronicles 1:30 the APB renders “Dumah” among listed names; in Joshua 15:52 it renders “Dumah” between Arab and Eshan, while Isaiah 21:11 opens, “An oracle of Dumah.”

   Genesis 25:141 Chronicles 1:30Joshua 15:52Isaiah 21:11

In the Anselm Project Bible: The APB presents the term as “Dumah” in the two name lists and the territorial list, and as “Dumah” in “An oracle of Dumah” in Isaiah 21:11. It does not by itself determine the referent of the proper name.