Surname Креган (Cregan 
, Креган 
) , all over the world, is quite a rare family name. The last name Креган is habitual in Ireland, where it is quite a common surname, Australia, where it is quite a rare surname, and the United Kingdom, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in the United States, Ireland, and the United Kingdom. Much less frequently, Креган is the forename as well as the last name.