A Bulgarian wizarding family that has produced at least two world-class Quidditch Beaters (Pm).
The elder Vulchanov was a Beater on the Bulgarian National Team that lost to Ireland in the 1994 Quidditch World Cup (GF8, Pm).
The elder Vulchanov's son, Boris, is also a Beater and was a member of the winning Bulgarian team at the 2014 Quidditch World Cup (Pm).
Vulchanov means "volcano", deriving from Bulgarian вулка́н (vulkan) (Dict.com: Bulgarian-English). It is similar in spelling to the name of the Bulgarian cinema actor and director Rangel Valchanov (Wikipedia: Rangel Valchanov).
They may be related to Nerida Vulchanova, the founder of Durmstrang (Pm).