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This little doozy i figured out all by my lonesome, in Freshman year Honors Euro Civ.

Lupin's first name is Remus. Lupin is close to Lupe which means wolf in Latin.

The founders of Rome, according to myth were two brothers raised by wolves named Romulus and REMUS and in the 7th Book Lupin uses the name Romulus as a code name. Am I freak? Fact. Is your mind blown? Fact.