Solomon
Proverbs 30:1ESV·traditional attribution

The words of Agur son of Jakeh. The oracle. The man declares, I am weary, O God; I am weary, O God, and worn out.

Matthew Henry Presbyterian @wholebiblehenry

Some make Agur to be not the name of this author, but his character; he was a collector (so it signifies), a gatherer, one that did not compose things himself, but collected the wise sayings and observations of others, made abstracts of the writings of others, which some think is the reason why he says (Pro 30:3), "I have not learned wisdom myself, but have...

Commenting on Proverbs 30:1-6

Geneva Bible Notes Reformed @genevanotes

The words of Agur the son of Jakeh, [even] the prophecy: the man spoke to Ithiel, even to Ithiel and Ucal, (a) Who was an excellent man in virtue and knowledge in the time of Solomon. (b) Who were Agur's scholars or friends.

Keil & Delitzsch Lutheran @keilanddelitzsch

Pro 30:1 The title of this first appendix, according to the text lying before us, is: “The words of Agur the son of Jakeh, the utterance.” This title of the following collection of proverbs is limited by Olewejored; and המּשּׂא, separated from the author’s name by Rebia, is interpreted as a second inscription, standing on one line with דּברי, as particularizing that first.