I KNOW this sounds strange but consider this:
Some lady friend of either low or high nobility (sorry I know) who was Greek, made a memoir of Napoleon's father and family, if I'm not mistaken.
This lady mentioned that the Buonoparte family, the family's real last name, spoke Greek in their household with this lady. Incidentally, 'Buonoparte" means "Good/Beautiful Part/Portion"
Researchers have found that Greeks from the Mani peninsula of Greece moved to Corsica and setteled there.
In Greek, Kalomeridi or Kalomero (in some Greek circles) means "Good/Beautiful Portion/Part"
When Napoleon's Father died, Napoleon was met in Paris by a Mr. Kalomero who took care of him, if my memory serves me well.
Coincidence? I don't think so.
Why would Bonaparte's family speak Greek ANYWAY? To be "international and exotic?"