Bravo belli, that's getting there. So the final list of letters not found in the [bold]Latin-rooted[/bold] names is...

Um, can I quote 'twenty' and 'hundred' as deriving from Old English rather than Latin? Let alone four, five, ten, eleven, twelve...
I'm pretty sure that in my 6 (?) years of Latin at school I never came across a word that included a 'w', yet on the basis of 'twenty' it needs to be eliminated.

Mav, I am really enjoying this mental exercise, but I think you should define your set of numbers!!!! 'Officially recognised' (whatever that may mean) or 'Latin-rooted'?