Let's assume there's a correct "brand" for Coca Cola in Arabic (I have no idea if there is, but I'm sure there's some large brand that was localized) - there will certainly be a very large number of people who recognize that brand name, even if they cannot read, and will recognize it if you break it, just like someone with no literacy at all can recognize something is broke if they see a coke can labelled LOCA CACO.