Family name ไอออน (Ion 
, ไอออน 
, Ai-On 
) , in all the world, is a widespread cognomen. The last name ไอออน is habitual in Romania, where it is a common surname, Moldova, and Equatorial Guinea, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Romania, Moldova, and Spain. More frequently, ไอออน is the forename as well as the last name.