Surname オン (Ong 
, On 
, Eon ) , globally, is a widespread cognomen. The last name オン is characteristic of South-eastern Asia, particularly Singapore, where it is a prevalent surname, Malaysia, where it is a common surname, and Brunei (explore the name in all countries). In absolute terms, it is commonest in South-eastern Asia, particularly Malaysia, Singapore, and Philippines. Likewise, オン is the forename as well as the last name.