Who was the son of Ubara-Tutu?

The son of Ubara-Tutu was Utu-hengal, an ancient Sumerian ruler. Utu-hengal is known for his role in the political landscape of Sumer during the early dynastic period, particularly in the city of Uruk. His reign is noted for efforts to resist the dominance of neighboring powers and for his contributions to the cultural and political developments of the time.