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French Creoles in the 1837 when Morphy was born were predominantly White French born in the Americas. The first major influx of Blacks, who married with some Creoles, occurred in the 1800's after the revolution in Haiti. But Morphy's mother was born in the early 1800's to a prominent, wealthy Creole family and its highly unlikely she had any Black heritage. Even today, most Creoles are White.
I'm fairly certain that Kid Creole out of "Kid Creole and the Coconuts" was black, so I think you must be mistaken.