"Hello" (American English)

German-Guten Tag

Konichiwa (japaneese)

Hola (Spanish)

Sorry to nit pick but "Guten tag" is "Good Day". "Hallo" is "Hello".

French - Bonjour

Thai = Sa-wut dee-ka (female)

Aloha - Hawaiian...

Aregato!! - Japanese

i think...

I thought is was Konichiwa... something like that for japaneese

well honestly i have no idea
but i remember my friend and i making fun of my other friend who took japanese
and said he was failing cuz the only thing he knew was aregato which was hi haha

Do they have to be different languages? Or can they be like local phrases that basically mean hello?
If so:

Top of the mornin' to ya, laddy (Irish)
G'day, mate (Australian)
Good day, old chap (British)

-Danielle

Dobre dehn (good day)
Dobre utra (good morning)
Dobre vecheram (good evening)
Zdravstuite! (hello)
--Russian

Halo / Helo / Alo / Hai / Oi = Indonesian

Selamat pagi / Pagi = Good Morning

Selamat siang / Siang = Gooday

Selamat sore / Sore = Good afternoon

Selamat malam / Malam = Good night

Moshi-moshi ("Hello" in japanese, when you answer the phone)

Italian: " ciao "

In Hindi, we say 'Namestey' & in malayalam (language of Kerala- South India), we say Namaskaram

Indonesian - Halo / Hai

Still it's pronounced 'halo' not 'helo'

And Hai, pronounced "Hi"

Hungary:

Jó napot! (good day)
Jó reggelt! (good morning)
Jó estét! (good night)

Hello -> Hello