Surname ハット (Hut 
, Hatto 
, Hutt ) , worldwide, is a common cognomen. The cognomen ハット is habitual in Estonia, where it is quite a common surname, Netherlands, and Luxembourg, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in the United States, the United Kingdom, and Netherlands. Very seldom, ハット is the forename as well as the last name.