How many giannas are there in the world?

Answer 1

The name "Gianna" does not refer to a specific entity or population, so it's unclear what you are asking about. If you are inquiring about the popularity of the name Gianna, it varies by country and region, but it is a relatively common name in places like the United States and Italy. For precise statistics, one would need to refer to naming databases or census data from specific countries.