The name Acacius is a boy's name of Greek, Latin, Ancient_Languages/Civilizations origin meaning "thorny; or, innocent, not evil". Acacius and is often added to user-created lists like Boy Names Inspired by Mythology and discussed in our forums with posts like "CAF Quiz With Three Choices!".
From the experts:
Acacius is a Latinized form of the Ancient Greek Akakios and can be interpreted to relate to the same root as the name Acacia, for the thorn bush, or Akakios which means "not evil." With the modern taste for ancient names that end in "us," this obscure but attractive choice may have a chance of new life. Acacius is the name of three early saints.