Sevanne
This pretty and unusual Armenian name is derived from the river Sevan in Armenia. It's normally spelled Sevan, but I like the Sevanne spelling, because it looks more like it's pronounced (seh VON) rather than "seven." I've also seen Sivan, but I don't like that as much. Sevana (seh VAH na) is another variation that it less traditional. I'd be afraid that people would think that Sevana was another kreativ spelling of Savannah.