The name Cadmus is a boy's name of Greek origin meaning "one who excels". Cadmus and is often added to lists like Mythological Baby Names for Boys and discussed in our forums with posts like "What would you name a sibling to...?".
From the experts:
Cadmus is the name of the serpent-slaying hero of Greek mythology who also founded the city of Thebes and is credited with inventing the alphabet. Its ancient feel might appeal to modern parents — especially since Cadmus Peverell is a human Harry Potter character, one of the three original owners of the Deathly Hallows.