According to RAE's dictionary
Quote:
guagua1.
(Etim. disc.).
...
3. f. Cuba y R. Dom. Nombre genérico de numerosas especies de insectos hemípteros, pequeños, de color blanco o gris, que atacan a numerosas plantas, especialmente a los cítricos, y llegan a destruirlos.
de ~.
....
guagua2.
(Del quechua wáwa).
1. f. Á. Andes. Niño de pecho. En Ecuador, u. c. com.
2. f. Perú. Pan dulce con forma de niño.
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For Cuba and Dominican Republic guagua means a family of insects that destroy citric trees (??news for me) no reference to its taino origin nor to buses or cars.
For the Andean countries guagua refers to lil babies. Its origin is stated as a quechua word (one of the ancient languages of the Andes region in south america).
Anyway, even when the dictionary does not state the word as meaning a bus... nobody that has lived here can deny guagua also refers to a dominican bus.
Jess