Bellavilla is a new cultivar of Masdevallia being grown specifically by a german nursery over several years of intense reproduction, in fact its supposed to be a more warm tolerant Masdevallia, so I suspect its a hybrid cross between several warm growers, they say the Bellavilla is more suitable for the home grower similar to a house plant. I assume you have seen one advertised on a European website, and will usually have BV Prefix before its hybrid name.