Frohe Weihnachten!
Merry Christmas!
Nollaig shona daoibh! (addressing in plural)
Gutes neues Jahr!
A prosperous new year!
�thbliain faoi mhaise daoibh!
T�im i nd�chas go bhfuil �dh m�r agaibh i mbliain seo chugainn!
I hope you have much luck in the coming year!
Beannacht libh, blessing with you,
R�diger (Roidsear)
...as I found out that the german name R�diger matches "Roger" in English
and Roidsear in both Gaeilge and G�idhlig (Scots Gaelic), I prefer to write "Roidsear"...
...and "Gwaewglyw" in Cymareg (Welsh), as a pen pal told me...
but I still don't know how to pronounce THIS! Hehe...