Pocomania and my African ancestory?

I am of Jamaican decent and have just discovered that my great grandfather was the 'shepard' of a pocomania group. I have researched this and discovered that it was brought over from Africa during slavery. I am very interested in discovering where in Africa my great great great grandad came from. Is there a... show more I am of Jamaican decent and have just discovered that my great grandfather was the 'shepard' of a pocomania group. I have researched this and discovered that it was brought over from Africa during slavery. I am very interested in discovering where in Africa my great great great grandad came from. Is there a dna test i can do to discover which african country my ancestors were taken from to work as slaves in Jamaica? Any help will be appreciated.
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