From to the OED: The name Scandinavia, which appears in the existing text of Pliny, is a mistake for Scadinavia, < Germanic *Skadīnaujā, whence by normal phonetic development Old English Scędenig (Beowulf 3336) = Old Norse Skáney (adopted in Old English as Scónég), the name of the southern extremity of Sweden; the terminal element is *aujā, Old English ég, íg, island.