Surname Уат (Уат 
, Vatt 
) , worldwide, is a rare family name. The surname Уат is habitual in Estonia, where it is a rare surname, Argentina, and Myanmar, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in Argentina, Myanmar, and the United States. More prevalently, Уат is the forename as well as the last name.