Last name タツオ (Tatsuo 
, タツオ , Tatuo 
) , in the world, is a common surname. The family name タツオ is characteristic of Eastern Asia, particularly Japan, where it is quite a common surname, Taiwan, where it is quite a rare surname, and Hong Kong, where it is a rare surname. Not in comparison with a country's population, it most frequently occurs in Eastern Asia, particularly Japan, China, and Taiwan. Much less frequently, タツオ is the forename as well as the last name.