Santa Cluas
We say Merry Christmas or Happy Christmas
say thanks, you too!
Joyeux Noël.
Feliz Navidad
Joyeux Nöel!
Scrooge initially replied with "Bah, humbug!" whenever someone said "Merry Christmas."
The link has a pretty complete list of how "Merry Christmas" is said in different parts of the world.
Frohe Weihnachten... merry Christmas
Russia.
"Merry Christmas" in Hindi is said as "शुभ क्रिसमस" (shubh krismas).
4 times because i counted it every time i said it.
In Russia.