Merya or Meryanic 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. Classification There is no general agreement on the relationship of Merya with its neighboring Uralic languages. It is sometimes left as unclassified within the western end of the family. A traditional account places Merya as a member of the Volga-Finnic group, comprising also the Mordvinic and Mari languages. However, Volga Finnic is today considered obsolete. Eugene Helimski supposed that the Merya language was part of a "northwest" group of Finno-Ugric, including also Balto-Finnic and Sami. Helimski argued that even though there are Mari parallels, they do not justify a close relationship with Mari and could be due to adjacency of the language areas. Gábor Bereczki supposed that the Merya language was a part of the Balto-Finnic group. One hypothesis classifies the Merya as a western branch of the Mari people rather than as a separate tribe. Their ethnonyms are basically identical, Merya being a Russian transcription of the Mari self-designation, Мäрӹ (Märӛ). T. Semenov and M. Fasmer believed Merya to be a close relative of Mari. Max Vasmer saw that many Merya toponyms have Mari parallels. Mordvinian author Aleksandr Sharonov claimed that Merya is an Erzyan dialect, however this doesn't have much support. Rahkonen (2013) argues that the likewise unattested and unclassified-within-Uralic Muromian language was a close relative of Merya, perhaps even a dialect of Meryan. A probable characteristic of the Merya language, which some researchers have noted, is the plural -k, while most Uralic languages use -t for the plural. Reconstruction There have been attempts to re-construct Merya based on toponyms, onomastics and words in Russian dialects by O. B. Tkachenko, Arja Ahlqvist and A. K. Matveev among others. The first reconstructions were done in 1985 by O. B. Tkachenko. The latest book about Merya reconstructions was published in 2019. As an example: in Russian toponyms around where Merya was spoken, an ending -яхр (-jaxr) is regularly seen in names relating to lakes. This also resembles, but does not exactly match, the words for 'lake'