Surname Айко (Aiko 
, Ayko 
, Айко 
) , all over the world, is quite a rare cognomen. The last name Айко is characteristic of Armenia, where it is quite a rare surname, Trinidad and Tobago, and Benin. Measured by absolute frequency, it most frequently occurs in Indonesia, Japan, and Kenya. More frequently, Айко is the forename as well as the last name.