"[Kristoffersen] banged her head on it until dragged to her feet by Keeper Karl Wang."
-- match report Bulgaria v Norway, Daily Prophet, 6 June 2014 (Pm)
Although a member of one of the teams predicted to win the Quidditch World Cup 2014 tournament, his team won against a weak Ivory Coast side in their first match but was then beaten by Viktor Krum's early catch of the Snitch during their quarter-final against Bulgaria (Pm).
Other canon notes and references
Karl is the Scandinavian form of Charles, which means "manly and strong, a free man" (Quick Baby Names).
Although Wang is the most common mainland Chinese surname, it is completely unrelated to the same surname in Scandinavia, which is a form of the name Vang, derived from Old Norse vangr meaning "field or meadow" (Wikipedia).
From the Web
Screenshots of the Daily Prophet's coverage of the 2014 Quidditch World Cup: http://imgur.com/a/AXutv