Surname Iogan (Иоган 
, Iogan 
) , in the world, is a rare last name. The family name Iogan is characteristic of Kazakhstan, where it is a rare surname, Georgia, where it is a very rare surname, and Kyrgyzstan. Measured by absolute frequency, this name is the most popular in Russia, Kazakhstan, and Germany. Also, Iogan is the forename as well as the last name.