Who are…
Dedanim

These are the descendants of Dedan, a son of Raamah/Raama whose brother was Sheba (Gen. 10:7; 1 Chr. 1:9). Dedan’s brothers were Asshurim, Letushim and Leummim (Gen. 25:3).

They are mentioned by the prophet Isaiah.

…In the thickets of Arabia you must spend the night, O caravans of Dedanites. —Isaiah 21:13 LSB

They are also as mentioned by the prophet Ezekiel among the merchants who supplied Tyre with precious things.

The sons of Dedan were your traders. Many coastlands were customers at your hand; ivory tusks and ebony they brought as your payment. …Dedan traded with you in saddlecloths for riding. —Ezekiel 27:15, 20 NASB