It depends on your style - traditional names like John, Robert, Peter, Phillip, Hugh, Stephen, Edmund, Christopher, Andrew etc aren't very popular anymore.
Or you can look to other countries for names more popular abroad than here - Xavier, Elias, Maxim, Lucian, Jared, Nathaniel, Ivo, Magnus etc.
Or you can go classical (Greek/Roman) or literary but not used that often - Orion, Caspian, Lysander, Atticus, Ferdinand, Corin, August etc