Etymology
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Mitty 

also Walter Mitty, in reference to an adventurous daydreamer, by 1950, from title character in "The Secret Life of Walter Mitty," short story by U.S. author James Thurber (1894-1961) first published in the New Yorker March 18, 1939.

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Walter 
masc. proper name, from Old North French Waltier (Old French Gualtier, Modern French Gautier), of Germanic origin and cognate with Old High German Walthari, Walthere, literally "ruler of the army," from waltan "to rule" (from Proto-Germanic *waldan, from PIE root *wal- "to be strong") + hari "host, army" (see harry). Walter Mitty (1939) is from title character in "The Secret Life of Walter Mitty" by U.S. short story writer James Thurber (1894-1961).
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