I think the Spanish would be hard to classify as anything else, being that they're largely the grand-grand-grand-...-grand-children of the Romans (already classified as _the_ prime example of Aryans by nazis and their apologists everywhere) and the Goths (which are really as pure germanic northmen as you can get, and pretty much idolized as such by the nazis and white supremacists.)
Of course, individual cases could still be Jews or descendants of the Arabs, but otherwise having a hispanic name or "hispanic genes" doesn't even come close to being a problem.