Is there any word in English that you should use when you want to say :
for a person and both of you know that you'll never see again?
or Something else?
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I think "Farewell" is the best you can do in English. It's a blessing for a good future and it carries a lot of emotion. "Goodbye" started out as a blessing, but now it usually means "'til next time" and it's a polite way to take one's leave. You might say "Goodbye" to your wife when you leave in the morning, but if you said "Farewell" she would wonder whether you were ever coming back.
Besides Farewell which seems to me the more appropriate, how about So Long, au revoir (French, but you might see it in English as well), adios or adieu?
In some movies when two characters know that they won't meet again, they say Later, which is a hopeful kind of goodbye, because it implies that you might see each other again (even though you won't)
If you are best buddies with the departing person, you might use an informal word like cheerio.
Or you might turn farewell into a sentence like I fare you well.
There really isn't a specific word for this in the English language itself, this is even used in the BBC program "Doctor Who" as a way to develop the main character, who says that he "always hates goodbyes" because he believes that saying goodbye means you will never see someone again.
As some other answerers have noted, words such as "sayonara" are often used to communicate finality, but other than that "goodbye for the last time" can only really be effectively said with the aid of context or tone of voice. The term "farewell" can, on occasion, be used for this but again, requires context. The word is actually a medieval word for wishing someone a good journey: literally to "travel well"
Sayonara. I have no idea why, but there is a definite sense of finality about it.
Japanese for 'goodbye'; however, it carries more finality. Instead of being used at the end of a day, as in "Goodbye see you tomorrow," it would be used in situations where you will either not see the person for a long time, if ever again.
From urban dictionary. Sometimes you find exactly what you are looking for.