The name Sargon is mentioned in Isaiah chapter 20, verse 1 :
“In the year that Tartan came unto Ashdod, (when Sargon the king of Assyria sent him,) and fought against Ashdod, and took it;”
This was not only the sole reference to Sargon in the Bible, but the only reference to him anywhere!
Critics waxed eloquent in condemning the Bible for such a blunder of inventing an Assyrian monarch who never existed. Many are quick to find fault with the Bible but are extremely disappointed and disturbed when, time and time again, it is they who are proven wrong.