The hydronym Lama comes from Tudgusic word laamu where it mean sea, ocean, big water.
#Mongolic, Tungus-Manchu and Paleosiberian languages (Монгольские, тунгусо-маньчжурские и палеоазиатские языки)
Jurchen–Manchu (Jurchen and Manchu are simply different stages of the same language; in fact, the ethnonym "Manchu" did not come about until 1636 when Emperor Hong Taiji decreed that the term would replace "Jurchen") is the only Tungusic language with a literary form (in Jurchen script and later the Manchu alphabet) which dates back to at least the mid- to late-12th century; as such it is a very important language for the reconstruction of Proto-Tungusic.
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In 1897 he undertook a journey to Siberia for the purpose of studying Tungusic, receiving a subvention from the Imperial Academy of Sciences of St. Petersburg.