Whose words are recorded in Proverbs 30?

Answer: Agur son of Jakeh

Proverbs 30 begins, "These are the words of Agur son of Jakeh—the burden that this man declared."

“These are the words of Agur son of Jakeh—the burden that this man declared to Ithiel: “I am weary, O God, and worn out.”— Proverbs 30:1 (BSB)