Dashiell's exact origin is uncertain, generally traced to a French surname possibly meaning "page boy" or attendant, though the connection is looser than for many older names. It's become associated instead with a spirited, adventurous character, largely through its use by a well-known 20th-century writer.
Those houses which behold not the Ascendant signifie occult or obscure places, and these houses are the 12th. 8th. and 6th. - William Lilly (1602.-1681.)