Is Kenya a proper noun a common noun or a collective noun?

The noun 'Kenya' is a proper noun, the name of a specific country.
A proper noun is the name or title of a specific person, place, or thing.

A common noun is a general word for a person, a place, or a thing.
Examples of common nouns for the proper noun 'Kenya' are country or republic.

A collective noun is a noun used to group people or things in a descriptive way.
Examples of collective nouns are a herd of buffalo or a hoard of tourists.