Charles Ellicott Commentary 1 Chronicles 18:9

"And when Tou king of Hamath heard that David had smitten all the host of Hadarezer king of Zobah," — 1 Chronicles 18:9 (ASV)

Now when ... — And Tou king of Hamath heard. In Samuel, the name is “Toi.” The Hebrew letters corresponding to w and y are often confused in manuscripts. Tô-û is correct. This form is also found in the Septuagint and Vulgate in Samuel. The Syriac has “Thû‘,” and the Arabic “Tû‘u.” The Syriac in this passage, however, has “Phûl king of the Antiochenes” (!), while the Arabic has “Phâwîl king of Antioch,” an apparent allusion to Pul the Assyrian (1 Chronicles 5:26). Professor Sayce believes he has read the name Tu-ve-es—that is, Toü—on the stones from Hamath, now in the British Museum.