Prior to the start of the 2014 Quidditch World Cup tournament, Wójcik was accused of being the transfigured Italian star Seeker Luciano Volpi. This was disproved by them standing side-by-side at a press conference (Pm).
Other canon notes and references
Bonawentura (Italian: bonaventura) means "good fortune". Saint Bonaventura was a 13th-century Franciscan monk who is considered a Doctor of the Church (Behind the Name).
Wójcik (also: Wojczik, Wojczyk, Wojszyk) is a common surname in Poland, possibly deriving from wojak (warrior) or wójt (chief officer of a municipality) (Wikipedia).
Is there something to be conjectured about the replacement of Bonawentura Wójcik as Polish Seeker by Wladyslaw Wolfke by the time of the actual tournament? Did Wolfke and Luciano Volpi ever appear anywhere together?
Lexicon list of Seekers
From the Web
Writing by J.K. Rowling on Pottermore:
Pottermore enhanced reading experience: Quidditch World Cup
Screenshots of the original Daily Prophet coverage of the 2014 Quidditch World Cup on Pottermore: Imgur archive
Harry Potter Wiki: Bonawentura Wójcik