Surname Кэссиди (Cassidy 
, Cassady 
, Cassidey 
) , across the world, is a common cognomen. The family name Кэссиди is habitual in Ireland, where it is quite a common surname, British Virgin Islands, and Bermuda (explore the name in all countries). Measured by absolute frequency, it is commonest in the United States, the United Kingdom, and Ireland. Also, Кэссиди is the forename as well as the last name.