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Surname Aichen (爱臣 , Aichen , Аишен ) , all over the world, is a rare cognomen. The last name Aichen is habitual in Japan, where it is a rare surname, the United Kingdom, where it is a very rare surname, and Malaysia. In absolute terms, it is commonest in China, Japan, and the United Kingdom. More prevalently, Aichen is the forename as well as the last name.