Is it a difference between Latvia and lettonia?

Latvia and Lettonia are two different names for the same country. Latvia is the official name of the country, while Lettonia is a historical and alternative name. The name "Latvia" is derived from the Livonian tribe of Latgalians, who inhabited the region in ancient times. The name "Lettonia" is a Latinized form of the name "Latvia" and was used in historical sources and documents. However, the country is now officially known as the Republic of Latvia.