Maceo is an old-school name that means gift from God, and it's best known as the moniker for jazz musician Maceo Parker. It's a cool way to get to that "Mace" nickname without going with the red-hot Mason. And Robert is a tried-and-true baby name that means famous. It's currently on a bit of a decline, but a name this classic truly never goes out of style. It's been used by a bunch of famous actors, from the classic Robert Redford to Robert Downey Jr. and Robert Pattinson. And Robert is also the name of Olivier's father, so that's probably the reason they picked that name.