I don't think Billy actually has a canon surname... But Cranston is the only one I heard until now. According to Rovang's Writer's guide, it was never reveiled in the show, but was mentioned on trading cards...
I quote :
"Cranston" is generally accepted as Saban's last name for Billy, though it didn't appear in the show. (Sources: PR trading cards, unaired detailed credits list for 'It came from angel Grove', etc.)
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