The accent isn't supposed to be on the last syllable in English. It isn't pronounced "fee-nah-LAY"; it's "fin-NALL-ee." In my experience, people sometimes correct the last sound to a long A rather than a long E, but I've never heard the accent on the last syllable. I think either you know some odd people or it's some regional variant.
> I think either you know some odd people or it's some regional variant.
I think you've read the thread a bit quickly and are a tad confused. I was talking about the Italian pronunciation. I know how it's pronounced in English as well, as that is my native language.
Oh, my apologies. I read "accent" as referring to the pronunciation (since you followed it with a contrast of "fee-NAH-lay" and "fee-nah-LAY"), but you meant the diacritic. Yeah, you're right, that's not the correct spelling of the word.
Source for British English: http://dictionary.cambridge.org/dictionary/british/finale?q=...
Source for American English: http://www.merriam-webster.com/dictionary/finale