Family name ともえ (Tomoe 
, ともえ) , around the globe, is a rare surname. The cognomen ともえ is habitual in Indonesia, where it is a very rare surname, Japan, and Italy, where it is an extremely rare surname. Measured by absolute frequency, it most frequently occurs in Indonesia, China, and Japan. Much more frequently, ともえ is the forename as well as the last name.