Merya language

Merya or Meryanic (Old East Slavic: мєр(ь)скъıї) is an extinct Finno-Ugric language, which was spoken by the Meryans. Merya began to be assimilated by East Slavs when their territory became incorporated into Kievan Rus' in the 10th century. However some Merya speakers might have even lived in the 18th century. There is also a theory that the word for "Moscow" originates from the Merya language. The Meryan language stretched to the western parts of Vologda Oblast and Moscow.