You say ' Merry Christmas' in the UK.
Just as in your question !They tend to say "Happy Christmas" instead of "Merry".Merry Christmas
Hanukkah is a holiday, not a language. You cannot say "Merry Christmas in Hanukkah. That's like asking: "How do you say Merry Christmas in Easter" I think he means how do you say merry Christmas in Hebrew
merry christmas
merry chrismack
merry christmas
merry chrismat
Merry christmas
Merry Christmas
"Merry Christmas"
Yoda might say, "Merry Christmas, you will!"
It's a clinker....