Despite its name, guinea pigs are not from Guinea nor are in the pig family. They are native to the Andes Mountains in South America. They are believed to have been called pigs because their structure is similar to that of a pig's body. young or baby guinea pig iis called a pup in English. In Dutch they are called Piglets because of the 'pig' part. Just like we call male guinea pigs boars and females sows … . Answer 2: There is no official name for baby guinea-pigs. The term pup is just a colloquialism, and is not correct.