Tou
From BiblePortal Wikipedia
Hastings' Dictionary of the Bible [1]
TOU . King of Hamath on the Orontes, who sent an embassy to congratulate David on his defeat of Hadadezer ( 1 Chronicles 18:9 f.). In the parallel passage, 2 Samuel 8:9 f., the name appears as Toi , which, however, is less probable philologically.
Smith's Bible Dictionary [2]
To'u. King of Hamath. 1 Chronicles 18:9-10. See Toi .
Holman Bible Dictionary [3]
1 Chronicles 18:9-10
Morrish Bible Dictionary [4]
See TOI.
International Standard Bible Encyclopedia [5]
tō´oo ( תּעוּ , tō‛ū ; Codex Vaticanus Θῶα , Thṓa ; Codex Alexandrinus Θοαύ , Thooú ): King of Hamath. As an enemy of Hadarezer, after David's victory over the latter, he sent David a message of congratulation ( 1 Chronicles 18:9 f). In 2 Samuel 8:9 f spelled "Toi."