Genesis 10:29

And Ophir, and Havilah, and Jobab: all these were the sons of Joktan.

Ophir. All the other sons of Joktan having settled in the south of Arabia, Ophir must be looked for in the same quarter, not in India or Ceylon. But whether, as Foster says it is a town and district (Ofer, in D'Anville's map) in the eastern part of the mountain of Oman, not far from the river of that name, or whether, according to Niebuhr, it is the principal port of the Sabaeans, situated between Aden and Dafar (Zafar), it is impossible, in the present state of knowledge, to determine.

Havilah - (see the note at Genesis 10:7.)

Jobab. The last son of Joktan is not identified with any Arab tribe; but it is probable that they are to be found in the Ioobaritai of Ptolemy, whom Bochart, followed by Gesenius, considers should be read as Ioobabitai.