Cognomen 伊瑟 (Eather 
, 伊瑟 
) , in all the world, is quite a rare surname. The cognomen 伊瑟 is habitual in Australia, where it is quite a rare surname, New Zealand, where it is a rare surname, and Nigeria. Measured by absolute frequency, it most frequently occurs in Australia, Nigeria, and Bangladesh. Much less frequently, 伊瑟 is the forename as well as the last name.