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Sorry, no etymologies found.
CIUTTI: No he visto hombre I have never seen a man de corazón más audaz; with a more audacious heart ni halla riesgo que le espante who never finds a risk he fears ni encuentra dificultad nor finds a single problem que al empeñarse en vencer he'll not attempt to vanquish le haga un punto vacilar. or that makes him halt a moment.
He writes, "the word vacilador, or the verb vacilar, is not translatable unfortunately, and it's a word we really need in English because to be vacilando means that you're aiming at some place, but you don't care much whether you get there.