Theon is of Greek origin, meaning "divine" or "gift from the gods." It is a unisex name, but it has been more commonly used for males. Theon was once popular during the Middle Ages, often appearing in medieval literature and history. In Greek mythology, Theon is associated with the Titan god of sight and prophecy. One famous bearer of this name is Theon Greyjoy from George R.R. Martin's "A Song of Ice and Fire" series and its television adaptation, "Game of Thrones.
"Name popularity seems to have shifted significantly over time. While Theon was a uncommon choice from the 1920s to the 1980s, it saw a resurgence starting around the late 1990s, with a significant increase in births since 2012."