does the signature of the witnesses on a will need to have their names printed under their signature?

The answer to your question is no BUT usually on the attestation page where the witnesses sign there are two or three (depending on the jurisdiction) places where the witnesses' names go.  As best practice, attorneys usually have witnesses print their names some where on that page during execution.....what good is the signature if you cannot read it to track them down if necessary, right! So although the answer is no, it's a good idea and good practice.  Hope that helps.