Gaelic...

[tayefeth]

Irish Gaelic is odd, and not just because of all of those accents that I can never figure out how to insert...

From what I can deduce, in Irish Gaelic:
Four is caethair
Fourth is caethru
Five is cuig
Fifth is cuigiu
Six is se
Sixth is seu
Twenty is fiche
Twentieth is fichiu
So if fifty is caoga, that would make fiftieth caogau?

If anyone reading this knows an Irish Gaelic speaker who could help, I'd really appreciate any help I can get...