Other canon notes and references
Sylvian is derived from the word sylvan meaning "wooded, associated with woods" and is related to the Latin word silva meaning "wood, forest" (Oxford English Dictionary). The more common spelling of the name in French is Sylvain "man of the woods" (Baby Namespedia), although there is an English singer-songwriter from the 70-80s called David Sylvian.
The surname Boigny is shared with the first President of Ivory Coast, Félix Houphouët-Boigny (1960-1993) (Wikipedia).
From the Web
Screenshots of the Daily Prophet's coverage of the 2014 Quidditch World Cup: http://imgur.com/a/AXutv