There are two different countries in Africa. One is Guinea-Bissau (its capital is Bissau). The other is called Guinea (its capital is Conakry, but the country itself is usually not called Guinea-Conakry).
Apparently, inhabitants of either country are called Guineans.
But it's amazing that the DNA outfit could establish a unique signature for Guinea-Bissau as opposed to Guinea or Senegal.
When I first looked at your picture, I thought it might have been a guinea pig -- possibly related to this area, possibly not....
Guinea pig
1664, native to South America and is so called either because it was first brought back to Britain aboard Guinea-men, ships that plied the triangle trade between England, Guinea, and South America; or from confusion of Guinea (q.v.) with the South American region of Guyana. (Online Etymology Dictionary).
> There are two different countries in Africa. One is Guinea-Bissau (its capital is Bissau). The other is called Guinea (its capital is Conakry, but the country itself is usually not called Guinea-Conakry). <
And don't forget the pathetic little African country named "Equatorial Guinea" -- considered by most old Africa hands whom I've known to be the worst of the worst.
Then on the northern coast of South America there were/are:
1. French Guiana (home to the French space-launch program and the prison in the movie "Papillon"),
2.British Guiana (now simply "Guyana," home to James Jones' famous kool-aid party), and
3. Dutch Guiana (now the hyper-corrupt, independent nation called "Surinam").
Finally there's New Guinea, just north of Australia. It's another paragon of ordered liberty and honest government.
Quite a group!