Origin of two middle names - help please.?

So, I'm trying to find out a little bit more about my dads side of his family. His father is African American, and his mother is Native American & White (German we believe) but that's what I'm trying to find out if he's got some German ancestry in him. His middle name is Debenion and mine is Isabelle is mother & her mother both have the name Isabelle, and he remembers faintly his mother telling him is middle name Debenion is German, and that she name him after a famous German athlete named Debenion but I cant find anything on the name. Can you please give me the origins of these two names ANY information one them both would be a big help - thank you!