tolkienlanguages1-9  Exercise 1: A Timeline
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  c. 1910-1911   Qenya begun (schoolboy in Birmingham)
  1910s          Gnomish / Goldogrin (Lexicon compiled 1917)
  1920s-1930s    Noldorin (grammar rewritten early 1930s)
  1937           Lhammas, written with the Etymologies
  c. 1951        Sindarin adopted

The name swap: the Noldorin of the early writings (grey-elven) becomes
Sindarin; the name Noldorin is then reused for the Quenya of the exiled
Noldor.

(Dates are those most commonly cited; sources differ on some.)