Cognomen גהאן (Gahan 
, גהאן 
) , all around the world, is a common last name. The family name גהאן is characteristic of Ireland, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Australia. In absolute terms, it is the most numerous in India, the United States, and Ireland. Very seldom, גהאן is the forename as well as the last name.