Albert Barnes Commentary 1 Kings 4:5

"and Azariah the son of Nathan was over the officers; and Zabud the son of Nathan was chief minister, [and] the king`s friend;" — 1 Kings 4:5 (ASV)

The son of Nathan – It is uncertain whether the Nathan of this verse is the prophet or the son of David mentioned in 2 Samuel 5:14. On the one hand, the position of "king’s friend" was more likely held by a contemporary, such as the prophet’s son, than by someone much younger, like the son of a younger brother. On the other hand, the title "cohen" seems to point to a member of the royal family. (See the next note.)

Azariah, who was "over the officers," was the chief of the officials mentioned in 1 Kings 4:8–19. This is apparent because the term used here is identical to the title given to them in 1 Kings 4:7.

Principal officer – Or, "cohen." The fact that the title kôhên was held by the sons of David in 2 Samuel 8:18, who could not be "priests" in the ordinary sense of the word, seems to identify the Nathan of this verse with David’s son from 2 Samuel 5:14 rather than with the prophet.