Jamaica is an English speaking country. You would say the same thing whether you are speaking standard English or Jamaican Patois, which is a dialect of English, and not a separate language.
The official language of Jamaica is English, so you would say 'Hello'
You say "Hello".
"Wa gwaan" is hello in Jamaican Patois.
Jamaican isn't a language. Their indigenous language is Arawakan.
"hi in Jamaician patois" Some of us(I'm Jamaican) say, "What a gwaan?" or "yuh good?"
Kamusta is how you say hello
hello, how are you today o_0