Cognomen Mamoru (守 
, Mamoru 
, マモル , and others...) , around the world, is a common last name. The family name Mamoru is characteristic of Eastern Asia, particularly Japan, where it is quite a common surname, China, where it is quite a rare surname, and Taiwan, where it is a rare surname. Measured by absolute frequency, it is the most numerous in China, Japan, and Indonesia. Much less frequently, Mamoru is the forename as well as the last name.