Nana is a given name that has different origins in several countries across the world.
[1] It is feminine in Japan, Georgia, Serbia and Greece, it is masculine in Ethiopia and India, and epicene (unisex/gender neutral) in Ghana and Indonesia.
Furthermore, the stool names of kings and queens are always preceded by Nana.
Non-royal Ghanaian people also use Nana as a given name.
In Ghana, one can respectfully refer to a King or Queen as Nana without mentioning their full name; much like using "Your Highness".