Cognomen タダヒロ (Tadahiro 
, タダヒロ ) , around the world, is quite a common family name. The last name タダヒロ is characteristic of Japan, where it is quite a rare surname, Taiwan, where it is a rare surname, and Malaysia. Not in comparison with a country's population, it is the most numerous in Eastern Asia, particularly Japan, China, and Taiwan. Much less frequently, タダヒロ is the forename as well as the last name.