Last name Tachay (Tahay 
, Tachay) , all around the world, is quite a rare surname. The last name Tachay is characteristic of Guatemala, where it is quite a rare surname, Belgium, where it is a rare surname, and Philippines. Not in comparison with a country's population, it most frequently occurs in Guatemala, Philippines, and Thailand. Very seldom, Tachay is the forename as well as the last name.