Did you know that they are neither pigs, nor did they come from Guinea, or cost a guinea (an old British coin worth Ã‚Â£1.05)? The name pig most likely came from their shape, and also from the endearing squeaking noises that they make. The scientific name for the guinea pig is Cavia porcellus , and porcellus means little pig in Latin. This is also why you may hear of them being referred to as Cavies. Read on to find out more fascinating facts about these delightful pets.