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Across the world, איין (Ein , Ayn , איין ) is quite a rare unisex first name. The forename איין is habitual in Saudi Arabia, where it is a rare gender-neutral name, the Democratic Republic of the Congo, where it is a rare masculine name, and Philippines, where it is a rare unisex name. Measured by absolute frequency, it most frequently occurs in Indonesia, the United States, and the Democratic Republic of the Congo. Also, איין is the last name as well as the forename.
איין is also a prevalent name for the fictitious and mythical characters: Ein , the fictional dog from Cowboy Bebop; ein junger Kassierer , the operatic character in the opera A Streetcar Named Desire; ein Arzt , the operatic character in the opera A Streetcar Named Desire; Ein Kerkerwächter , the operatic character in the opera Agnes von Hohenstaufen and Ein , the fictional character from Dead or Alive, Dead or Alive 5 Last Round, and in many other works.