Premise: Nana Kwame Abrokwa (born 5 October 1968) is a Ghanaian born German rapper and DJ, performing under the pseudonyms Nana or Darkman / Nana. Nana is not an actual first name, but a Ghanaian title of nobility. His most important achievement came in the second half of the 1990s, when his style was characterized as "euro-rap".
Hypothesis: "Nana" is not a title.