Answer
The most devoted fans of Engelbert Humperdinck are called Humperdinckers. The name was coined by Humperdinck himself in 1976, and it has since become a term of endearment for his fans. Humperdinckers are known for their loyalty and dedication to the singer, and they often travel long distances to see him perform. They also collect memorabilia related to Humperdinck, and they participate in fan clubs and online forums.