How do say thank you in Ukrainian?

Answer 1

Thank you = Diakuiu

Thank you very much = Duzhe diakuiu

The above is the transliteration from the cyrillic letters. In cyrillic it is like this:

Thank you = дякую

Thank you very much = дуже дякую

The transliteration table I used I found here (bottom of page):

http://www.ukrweekly.com/old/archive/1996/429612.shtml

Answer 2

You say "thank you" in Ukrainian as "дякую" which is pronounced as "dyakuyu".