Last name Hatto (Hatto , ハット ) , across the world, is a rare surname. The last name Hatto is habitual in Estonia, where it is quite a rare surname, Portugal, where it is a rare surname, and the United Kingdom. Not in comparison with a country's population, this name is the most popular in the United Kingdom, Egypt, and the United States. Likewise, Hatto is the forename as well as the last name.