Percy is a boy’s name of French origin. This name means "one who pierces the valley." But if that definition doesn't really do it for you, you could always take heart from various musicals, books, and movies with famous Percys. _Harry Potter’_s Percy Weasley and titular protagonist Percy Jackson have moved a generation towards the magic of spells, sorcery, and demigods—perfect inspiration for the little boy about to bring a whole new sense of wonder to your home.