unit of electrical power, 1882, in honor of James Watt (1736-1819), Scottish engineer and inventor. The surname is from an old pet form of Walter and also is in Watson.
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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).