Claude Debussy was a French composer who was very influential at the end of the 1800s and the beginning of the 1900s. He is often labelled as the first impressionist composer, borrowing the terminology from the 19th century style of French painting, although Debussy himself refused and detested the label.
Debussy's full name was Achille Claude Debussy and he used different variations of his name throughout his life. He began his career by using Achille-Claude (in its hyphenated version) to sound more prestigious and occasionally split his surname into de Bussy. However, he then reverted to signing off only as Claude Debussy.
The correct pronunciation of Claude Debussy in French is Klod Deh-boo-see. The "o" sound in -Klod is a closed sound and it is pronounced similarly to the "o" in the word "story". The "e" in Debussy is rather complicated to transcribe without IPA because while it is an "e" sound, it also sounds similar to a "uh" sound.