Proverbs 30:1
ESV - 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.
KJV - The words of Agur the son of Jakeh, even the prophecy: the man spake unto Ithiel, even unto Ithiel and Ucal.

This verse is a great illustration of some of the difficulties in translating the Bible. Should this word/phrase be translated literally or is it someone's name? Since Hebrew names were always derived from real words, it can be hard to tell.