It was probably named for General Joseph Totten who was Chief of Engineers for the U.S. Army. In 1848, Totten was in charge of a survey of the Florida coast concentrating on Biscayne Bay, with Robert E. Lee as a subordinate.
U.S. Coast Survey chart #68, Florida Reefs, Key Biscayne to Carysfort Reef (1858) has Totten's Key.
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