Origin of speedo
1950–55; by shortening; cf. -o
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Word Origin and History for speedo
trademark name of a brand of swimwear, 1928, originally made by McRae Hosiery Manufacturers, Australia. From speed.
Online Etymology Dictionary, © 2010 Douglas Harper