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Globally, Caoin (Keen
, Caoin) is a common gender-neutral first name. The first name Caoin is habitual in the Democratic Republic of the Congo, where it is a rare unisex name, India, and Singapore, where it is a rare male name. In absolute terms, the name is most common in India, the Democratic Republic of the Congo, and Philippines. More prevalently, Caoin is the last name as well as the forename.
Caoin is also a name for the fictitious and mythical characters: .