The word “guagua,” which for Cubans means bus, comes from the English Wa & Wa Co. Inc (Washington, Walton, and Company Incorporated) which was the first United States factory to export buses to the island. The logo of Wa&Wa Co. Inc. was a white blue and red hare, colors of the American flag, and figured prominently on the front, back and sides of their buses.
Additional notes: The closest English approximation of the sound of the Cuban word “guagua” is “wawa.”
Source: Eagle eyed translator Norma Whiting. Thanks Norma!