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
ba bye - Creole
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
Punha Bhetu - Marathi
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)
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
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 (literally means "Until we see again")
Bog - Croatian (literally means "God", but can be pronounced “bok,” so it is differentiated 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 pronunciation 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)