I'm from Germany and I love this name, it's my cousin's name. In German Wilbur comes from the Germanic elements wilþī- (Proto-Germanic *wilþijaz-) „wild", and ebur (Proto-Germanic *eburaz) „boar". The name symbolizes relentlessness and toughness as wild boars were not only hard to hunt but were ferocious fighters, it's why the Germanic tribes had so much admiration and respect for the animal. Beautiful name.