Let me help you: he plays a Bulgarian wizard. So he most likely come from...?
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Victor Krum - Stanislav ianevski
The following characters have names beginning with K:Katie BellKingsley ShackleboltKreacherViktor Krum and Igor Karkaroff are often referred to by their surnames.
SPOILER ALERT!: Hermine ends up going out with, and marrying Ron Weasly. At some moment she also likes Victor Krum.
The Bulgarian National Quidditch Team's Seeker. He is also Durmstrangs champion for the Twiwizard Tournament in the fourth Harry Potter book, though Harry wins, of course (and Cedric along with him, I guess).
Professor McGonagall thought that Harry Potter would be a good seeker after she watched him catch a remembrall in mid air during his first time on a broomstick. She also arranged for Harry to be allowed a broomstick, despite first years not usually being allowed to have one.