The name Gravity is a girl's name . Gravity and is often added to user-created lists like Virtue & Concept Names and discussed in our forums with posts like "Names on NB that make you go WOW!".
From the experts:
Gravity will probably be too heavy and grave -- sorry -- for most parents. But one possible exception might be big fans of Alfonso Cuaron's 2013 movie Gravity. And astrophysicists.