Answer the following question: Extract the answer to the question from the following context. Question: What is Engelbert Humperdinck's last name? Context: Artists contributing to this format include mainly soft rock/pop singers such as, Andy Williams, Johnny Mathis, Nana Mouskouri, Celine Dion, Julio Iglesias, Frank Sinatra, Barry Manilow, Engelbert Humperdinck, and Marc Anthony.
Answer:
Humperdinck