Of course we should change our name, we broke away from a sport, and created a different sport, but kept calling it the same name!
Gridiron have come up with a different name, and we can't call it Football. We might reduce to 12 a side, so not Thirteen for me. The Welsh word for 13 is tri-ar-ddeg, we could use that phonetically, and call it treearthehg.
How does Treearthehg sound, and it looks unique