Latvian language
Upper Latvian dialect is spoken in Eastern Latvia. It is set apart from rest of the Latvian by number of phonetic differences. The dialect has two main varieties – Selonian and Non-Selonian. There is a standard language, the Latgalian language, which is based on deep Non-Selonian varieties spoken in south of Latgale. The term "Latgalian" is sometimes also applied to all Non-Selonian varieties or even the whole dialect. However, it is unclear if it is accurate to use the term for any varieties besides the standard language. While the term may refer to varieties spoken in Latgale or by Latgalians, not all speakers identify as speaking Latgalian, for example, speakers of deep Non-Selonian varieties in Vidzeme explicitly deny speaking Latgalian.
Livonians
The Livonians, or Livs (Livonian: "līvlizt"), are a Finnic ethnic group indigenous to northern Latvia and southwestern Estonia. Livonians historically spoke Livonian, a Uralic language closely related to Estonian and Finnish. The last person to have learned and spoken Livonian as a mother tongue, Grizelda Kristiņa, died in 2013, making Livonian extinct. As of 2010, there were approximately 30 people who had learned it as a second language.