1) Russian surname 
The word Litvin (літвін, ліцвін, litvin, litsvin; Litwin, plural: Litwini, литвин, litvin, литвин, lytvyn) is a Slavic term meaning residents of the Grand Duchy of Lithuania. Recently it has been used in modern Belarus to describe ethnic Belarusians in historical contexts. In other contexts it can also refer to Slavic peopl...