Cognomen イーサー (Ether 
, イーサー) , all around the world, is quite a rare surname. The family name イーサー is habitual in Bangladesh, where it is a rare surname, France, where it is a very rare surname, and Honduras. Not in comparison with a country's population, it is the most numerous in Bangladesh, the United States, and Nigeria. Also, イーサー is the forename as well as the last name.