The past 12 months have given us laughter and tears, good times and bad and yet we moved on. Not dwelling on the bad or lingering to long with the good. And so it is that I shall say goodbye once again
- Farewell - English (formal)
- Bye - English (casual)
- totsiens / tot siens - Afrikaans (standard)
- tot weersiens - Afrikaans (informal)
- tot wederom - Afrikaans (informal)
- wederdom - Afrikaans (informal)
- koebaai - Afrikaans (informal; derived from English "Good-Bye")
- ghoebaai - Afrikaans (informal; derived from English "Good-Bye")
- baai - Afrikaans (informal; derived from English "Bye")
- arriewarie - Afrikaans (informal; folk etymology from "Au revoir")
- tatta / tata - Afrikaans (children's language)
- vaarwel - Afrikaans (formal)
- elalleqa - Arabic
- khodaa haafez _ persian
- aabar dekha hobey - Bengali
- Donadagohvi - Cherokee
- Hagoonea' - Navajo
- Ahoj - Czech
- Ja ne / じゃね (informal) - Japanese
- Ja mata ne / じゃまたね (formal) - Japanese
- Sayonara / さよなら (if you will not see them for a long time) - Japanese
- Auf Wiedersehen - German
- Bis dann - German
- Tschüss - German
- Ade - German
- Tschau - German
- Bis Spater (Bis Schpaater)- German
- Viszlát! - Hungarian
- Arrivederci - Italian
- Addio - Italian
- Ciao - Italian
- Buona sera - Italian
- Adieu - French [add-ee-uh] (farewell) very formal
- Au Revoir - French (aw reh-VWAH)
- À bientôt - French (see you later)(ah bee-EN-toe)
- À demain - French (see you tomorrow)(ah deh-MAN)
- Hejdå - Swedish
- Aloha - Hawaiian
- Le'hitraot - Hebrew
- Shalom - Hebrew
- Aavajo - Gujarati
- Sampai Jumpa - Indonesian
- Adios - Spanish
- Paalam - Filipino
- Zai Jian - Chinese, Mandarin
- Zoi Geen (the "g" is pronounced like geek) - Chinese, Cantonese
- Farvel - Danish
- Namaste (same as hello) - Hindi ( this video shows you how to pronounce namaste: http://www.youtube.com/watch?v=FXlcpjgyrOg )
- Fir Milenge (see you) - Hindi
- Alvida (Goodbye, bit formal) - Hindi
- Ayo - Papiamentu
- Rub Rakha - Punjabi
- Feri bhetaula (lit. we'll meet again) - Nepali
- Do zobaczenia (see you) - Polish
- Żegnaj - Polish
- Adeus - Portuguese
- Tchau - Portuguese
- Do svidan’ya/До Свидания (until we meet again, formal)- Russian
- Poka/Пока (pronounced pa-ka, informal) - Russian
- Do vstrechi/До Встречи (until we meet again) - Russian
- Selamat jalan - Malay
- Selamat tinggal - Malay
- Tot ziens - Dutch
- Dag - Dutch
- Doei - Dutch
- 再见 - Chinese
- Yasou (YAH-soo) - Greek
- Hwyl fawr - Welsh
- Annyeonghi Kyeseyo(if the person you're talking to isn't leaving) - Korean
- Anyeonghi Gasyeo(if the person you're talking to is leaving) - Korean
- Näkemiin (See you) - Finnish
- Hyvästi (Farewell) - Finnish
- Hasta La Vista (see you later) - Spanish
- Adios - Spanish
- Te veo despues - Spanish
- Vale- Latin (to one person)
- Valete- Latin (to more than one person)
- La revedere - Romanian
- Veloma - Malagasy
- Sige la - Pangasinan
- Khuda Hafiz - Urdu
- zai jian - Chinese
- Ha det bra - Norwegian
- Ha det - Norwegian
- Sees - Norwegian
- Snakkes - Norwegian
- Vida parayunnu - Malayalam
- Vidaiperukiren - Tamil (very formal, in fact no one uses this)
- Ok maams - Tamil (very informal, use with mates only)
- Poitu Vaarein (Taking leave but will visit again)- Tamil (standard fare)
- Vaarein (Will come again) - Tamil short for Poitu Vaarein
- Slan - Irish
- Aavajo - Gujarati
- Чао - Macedonian
- Doviđenja - Croatian (litteraly means "Until we see again")
- Bog - Croatian ( litteraly means "God", but can be pronounced Bok! so it is differencianised from the word "God")
- Ćao - Croatian ( Primarily used in Coastal Croatia, because of it location very close to Italy, where you would say "Ciao" and the prounanciation of Ciao and Ćao are similar, if not the same)
- Mattae Sigona - Kannada (Used for meet you again sometime)
- Chao - Serbian/Bulgarian
- Nawatha hamu wemu - Sinhalese (This means "Catch you later")
- Subha dawasak - Sinhalese (This means "Have a nice day")
- Nasvidenje - Slovene (Formal)
- Adijo - Slovene (Bye)
- Čav - Slovene (Also čao and is pronounced as italian ciao)
list copied from http://www.wikihow.com/Say-Goodbye-in-Several-Different-Languages