There is no mention in the original of “spice merchants.” Two classes of traders are spoken of; but both expressions are general.
Kings of Arabia - Rather, “kings of the mingled people” (compare Jeremiah 25:24). These were probably tribes half Jewish, half Arabian, on the borders of the western desert. They are regarded as Arabs by the author of Chronicles (marginal reference).
Governors - The word used here is thought to be of Aryan origin. It appears to have been a title given by the Persians to petty governors, inferior to the great satraps of provinces. We find it borne by, among others, Tatnai Ezra 5:6, Zerubbabel Haggai 1:1, and Nehemiah Nehemiah 5:14. It can scarcely have been in use among the Jews so early as Solomon, and we must therefore suppose it to have been substituted by the writer of Kings for some corresponding Semitic title. The empire of Solomon was not a state governed from a single center by an organisation of satrapies or provinces (1 Kings 4:21 note). But exceptionally, in some parts of the empire, the kings had been superseded by “governors” (compare 1 Kings 20:24).