Originally they called all Blacks born in Louisiana creoles, Blacks not brought over from Africa or the islands, but born in Louisiana. Now Creole means having a mix of African, Native American and French Blood.
I'm from central Louisiana were there's a ton Creole and Cajun heritage. My girl is "Creole" with a the African, French and Native American lineage they can trace back to Old Louisiana. Most Louisianian have African, Indian and French blood and heritage, but our family didn't keep record or don't have the French Last name to trace the family roots. For some reason the last name is important, even thought you can have the bloodline and not the last name.
Cajun was always a culture to me. The way we talk, cook, our music, the lifestyle.