This seems like a folk etymology, and a dubious one at that. A quick investigation of support turns up a Wikipedia article that's cited to an about.com post th

This seems like a folk etymology, and a dubious one at that. A quick investigation of support turns up a Wikipedia article that's cited to an about.com post that's cited back to the Wikipedia article (where they claim a Spanish etymology), and the Spanish-language article on the topic is cited back to the same About.com post. :P