About Latvian
Latvian is the official state language of Latvia. It is also sometimes referred to as Lettish. There are about 1.4 million native Latvian speakers in Latvia and about 150,000 abroad. The Latvian language has a relatively large number of non-native speakers, atypical for a small language. Because of language policy in Latvia approximately 30% of the 924,000 ethnic-minority population of Latvia speak Latvian. The use of the Latvian language in various areas of social life in Latvia is increasing.

There are three dialects in Latvian: the Livonian dialect, Latgalian and the Middle dialect. The Livonian dialect is divided into the Vidzeme variety and the Courland variety. The Middle dialect, the basis of standard Latvian, is divided into the Vidzeme variety, the Curonian variety and the Semigallian variety. Latvian dialects should not be confused with the Livonian, Curonian, Semigallian and Selonian languages.

source: Wikipedia