Cognomen Ватару (渡 
, Wataru 
, Vataru 
) , in all the world, is quite a common surname. The cognomen Ватару is characteristic of Japan, where it is a rare surname, China, and Singapore. Not in comparison with a country's population, it is commonest in China, Japan, and Indonesia. Also, Ватару is the forename as well as the last name.