Adam Clarke on Genesis 10:7

Seba - The founder of the Sabaeans. There seem to be three different people of this name mentioned in this chapter, and a fourth in Gen 25:3.

Havilah - Supposed by some to mean the inhabitants of the country included within that branch of the river Pison which ran out of the Euphrates into the bay of Persia, and bounded Arabia Felix on the east.

Sabtah - Supposed by some to have first peopled an isle or peninsula called Saphta, in the Persian Gulf.

Raamah - Or Ragmah, for the word is pronounced both ways, because of the ע ain, which some make a vowel, and some a consonant. Ptolemy mentions a city called Regma near the Persian Gulf; it probably received its name from the person in the text.

Sabtechah - From the river called Samidochus, in Caramanla; Bochart conjectures that the person in the text fixed his residence in that part.

Sheba - Supposed to have had his residence beyond the Euphrates, in the environs of Charran, Eden, etc.

Dedan - Supposed to have peopled a part of Arabia, on the confines of Idumea.