title_body: Were Tolkien's Elvish languages based on known natural languages?
upvoted_answer: Tolkien started really early in his life to develop languages. Started at 13 and developed languages till his death.
  
  
    Tolkien was a professional philologist and a specialist in the Old
    English language. He was also interested in many languages outside his
    field and developed a particular love for the Finnish language (he
    described the finding of a Finnish grammar book as "entering a
    complete wine-cellar filled with bottles of an amazing wine of a kind
    and flavour never tasted before".
  
  
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    Finnish morphology (particularly its rich system of inflection) in
    part gave rise to Quenya. Another of Tolkien's favorites was Welsh —
    and features of Welsh phonology found their way to Sindarin. Numerous
    words were borrowed from existing languages, but less and less
    obviously as Tolkien progressed. Words that are an exact match with
    existing Welsh words can be found in the early drafts of Tolkien’s
    manuscripts published as The History of Middle-earth,[4] but attempts
    to match a source to a particular Elvish word or name in works
    published during his lifetime are often very dubious.
  
  
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  Source: Languages (Tolkien Gateway)