Last name Ханнон (Hannon 
, Ханнон 
) , all around the world, is a common family name. The cognomen Ханнон is characteristic of Ireland, where it is quite a common surname, Jersey, and Belgium, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in the United States, Ireland, and the United Kingdom. Much less frequently, Ханнон is the forename as well as the last name.