Some will recognize this as a Harry Potter baby name (although a surname) and some will recognize this as an anime name - Lupin III. The main character Arsène Lupin from the animated Ghibli movies was first created by French writer Maurice Leblanc. Others know it as a plant name, also called lupine, which means "wolf," from Latin lupinus.
For those who haven't seen the animated show and movies or read the original story, it is the adventure of a "gentleman thief" that was popular in literature and resembled Sherlock Holmes. The animated version, originally from Japan, was also a great success in Italy - so much so that Suzuki made a model of their car called "Swift" that was a special Lupin the 3rd edition.
Lupin (and Lupine) is so rare that there are no records of births with the SSA in America, although it is a rare surname. White Pages claims there are 21 people named Lupin, as of 2011.