I think it's definitely usable. It's a popular enough name that people will have more associations than the
Madeline cartoon or
Madeleine McCann.
The
Madeline books are a pretty cute association for me. At least where I live, people would be more likely to associate
Madeleine with the books than the poor little girl.
Also, madeleine cookies are a delightful association!
http://en.wikipedia.org/wiki/Madeleine_(cake)