King Tou or Toi is the name of a king of Hama

Hama

Hama is a city on the banks of the Orontes River in west-central Syria north of Damascus. It is the provincial capital of the Hama Governorate. Hama is the fourth-largest city in Syria—behind Aleppo, Damascus, and Homs—with a population of 696,863...

th, a city located in Syria

Syria

Syria , officially the Syrian Arab Republic , is a country in Western Asia, bordering Lebanon and the Mediterranean Sea to the West, Turkey to the north, Iraq to the east, Jordan to the south, and Israel to the southwest....

. He is only mentioned in 2 Samuel 8:9-10 and 1 Chronicles

Books of Chronicles

The Books of Chronicles are part of the Hebrew Bible. In the Masoretic Text, it appears as the first or last book of the Ketuvim . Chronicles largely parallels the Davidic narratives in the Books of Samuel and the Books of Kings...

 18:9-10.

Biblical text (KJV)

9 Now when Tou king of Hamath heard how David had smitten all
the host of Hadarezer king of Zobah;

10 He sent Hadoram his son to king David, to enquire of his welfare, and to congratulate him, because he had fought
against Hadarezer, and smitten him; (for Hadarezer had war
with Tou;) and with him all manner of vessels of gold and
silver and brass.