A Greek Christian name from Greek akakios, meaning "innocent" or "without evil," borne by early saints.
Acacius comes from the Greek akakios, a name tied to innocence, harmlessness, or being "without evil." It entered Christian use early and was borne by saints, which gave it a quiet authority and an air of moral seriousness.
The name belongs to the older layer of Greek Christian naming, where meaning and sanctity often traveled together. In modern ears, Acacius feels stately, rare, and unmistakably antique. It has the kind of formal rhythm that suggests church history, scholarship, and a name preserved more by tradition than by fashion. That rarity is part of its appeal: Acacius sounds like it has survived intact from an older world, carrying virtue not as decoration but as its central idea.