From the capital city of Cuba
Havanah is a modern phonetic spelling of Havana, the capital city of Cuba. The city's name likely derives from the name of a local Taino chief, Habaguanex. As a given name, it follows the trend of using exotic place names and ends with the popular 'h' suffix.
Less common today
Havanah isn't in the latest US Top 1000. It last peaked at #8,438 in 2018.
US births per 5-year period, 1990βpresent (SSA data).