What is the exact meaning of the Latin name "Numitor"?

Yes, I'm aware that Numitor was the king of Alba Longa in Roman mythology, favored by his father Procas, dethroned by his brother Amulius and rescued by Romulus and Remus, his grandsons by his daughter Rhea Silvia. I know the myth more or less, but while we're still on the subject, what's the meaning of these last three names?