The name Theon is a boy's name of Greek origin meaning "godly". Theon and is often added to lists like Cool Boy Names From Ancient Cultures and discussed in our forums with posts like "Change One Letter".
From the experts:
Theon, an ancient name attached to a noted Greek teacher of mathematics and astronomy, also father to the first woman mathematician, might appeal to parents in this field. You can think of Theon as Theo with something a little extra.
Theon is also the name of a major character in Game of Thrones -- albeit a rather notorious character, Theon Greyjoy, who is known as Reek after undergoing months of brutal torture at the hands of sadist Ramsay Snow.