Globally, Грена (Grena 
, Graine 
, Грена 
) is a rare mostly female, but infrequently masculine first name. The first name Грена is habitual in Tanzania, where it is a rare girly name, Algeria, where it is a rare masculine name, and the Democratic Republic of the Congo, where it is a rare feminine name. More prevalently, Грена is the last name as well as the forename.