There are a few Australian authors with the surname Fallon, including Jennifer Fallon and Kathleen Mary Fallon. There is a pornographic actress called Fallon (b 1967). I'm probably not allowed to tell you what she is famous for doing first, but her nickname is "Squirter". I think of this as either a literary name given in honour of the various writers, or else a pornstar name.
Fallon became a popular name for girls in the 80's, after it was used for a character in the prime-time soap Dynasty. Fallon Carrington was played first by Pamela Sue Martin and then by Emma Samms after Anderson developed an illness. (No explanation was offered on the show as to why Fallon was suddenly three inches taller and had a British accent.)