Gladly, although It's sort of embarrassing, BrandonB, palmerc7 and I came in this morning, found the totally destroyed remains of a dragon (slain by the heroic efforts of Grayven, WilsonsMum, and TrueMaja), and all we had to do was name it.
Oh well, I have a 7-letter word, more modern, but only slightly more frequently used than "wyvern".