The Collaborative International Dictionary of English v.0.48:

Havana \Ha*van"a\ (h[.a]*v[a^]n"[.a]), prop. a.
   Of or pertaining to Havana, the capital of the island of
   Cuba; as, an Havana cigar; -- formerly sometimes written
   Havannah. -- n. An Havana cigar.
   [1913 Webster]

         Young Frank Clavering stole his father's Havannahs, and
         . . . smoked them in the stable.         --Thackeray.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Havana
    n 1: the capital and largest city of Cuba; located in western
         Cuba; one of the oldest cities in the Americas [syn:
         Havana, capital of Cuba, Cuban capital]