I think it's cool to learn how you say merry Christmas in different languages. I picked 25 normal languages and 3 made up languages for you geeks that might be looking at this. I chose my languages by looking at a list of the 30 most widely spoken languages and by adding in a few others that might be cool to know. Go ahead and learn them, impress your friends. Don't ask me to help you pronounce some of these words though.

LANGUAGE HOW YOU SAY IT
Bengali

subho baradin

Cherokee ulihelisdi danisdayohihvi
Chinese 圣诞快乐 (shèng dàn kuài lè)
English merry Christmas
French joyeux Noël
Georgian gilocav shoba axal wels
German frohe Weihnachten / fröhliche Weihnachten
Haitian Creole jwaye Nowel
Hawaiian mele Kalikimaka
Hebrew חג מולד שמח (hag molad saméa'h)
Hungarian boldog karácsonyt
Icelandic gleðileg jól
Ilocano naragsak a paskua
Indonesian selamat Natal
Irish Gaelic Nollaig shona
Italian buon Natale
Javanese sugeng Natal
Japanese merii kurisumasu
Polish

wesołych świąt bożego Narodzenia
Spanish feliz Navidad
Swedish God Jul
Tagalog Maligayang Pasko
Thai สุขสันต์วันคริสต์มาส (souksaan wan Christmas)
Tongan mele Kilisimasi
Turkish Noeliniz kutlu olsun


Below is a way to say "Merry Christmas" in three science fiction and fantasy languages. Since they are made up languages it doesn't actually translate to "Merry Christmas" so I put the actual translation as well.


LANGUAGE HOW YOU SAY IT ACTUAL TRANSLATION
Klingon (Star Trek) toDwI'ma' qoS yItIvqu' Our Savior's birthday you-enjoy!)
Quenya (Lord of the Rings) Alassë a Hristomerendë Joyous Feast of Christ
Sindarin (Lord of the Rings) Mereth Veren e-Doled Eruion Joyous Feast of the Coming of the Son of God