User
It was not the Father, but Agur son of Jakeh who wrote those words, who was referring to a son in verse 4.
It seems most likely that Agur was referring to the son of God. Quite interesting given the time that the proverb was probably written.
The Jewish interpretation is interestingly different:
http://en.wikipedia.org/wiki/Agur#Status_as_Prophet_of_Christianity
Guru Hank
Yahweh, the Great Angel and 'son' of the Lord Most High.
Mister Kelly
Not insomuch that I'm asking this question, but importantly, here in Proverbs, Agur asks the question.....
Anonymous
A rhetorical son; a non-existent person. The questions are all rhetorical questions, and the question asking if you can name the person or his son is also rhetorical: the point is that there are no such people.
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Jim carrey