Navy is a fleet of military watercraft, a dark blue color, and a perfectly unique name for either a boy or a girl. Who will require a navy-colored nursery scheme, naturally.
... Nave? *shrug*
Famous people named Navy:
Daughter of singer Nivea & rapper The Dream, Navy Talia Nash; daughter of singer Jason Aldean, Navy Rome Aldean.
The U.S. Navy has over 380,000 sailors on active duty, and almost 160,000 reservists.