From Greek Ariston, meaning best or excellent.
Ariston rings with the clarity of ancient Greek idealism. It derives from "aristos," meaning "best" or "excellent," combined with the common Greek nominal suffix "-on" — making it a declaration of superlative quality that the Greeks, who believed excellence (arete) was the highest human aspiration, considered an entirely appropriate thing to name a child. The same root generates a remarkable family of names: Aristotle ("best purpose"), Aristophanes ("best appearing"), Aristocles ("best glory") — and it is worth noting that Aristocles was reportedly the birth name of the philosopher we know as Plato, suggesting Ariston's orbit is very close to the philosophical center of Western thought.
Ariston was indeed the name of Plato's father, an Athenian of aristocratic lineage who claimed descent from the early Athenian kings. The name was also borne by a king of Sparta in the sixth century BCE and by Ariston of Chios, a Stoic philosopher of the third century BCE who took a provocatively minimalist stance on ethics, arguing that virtue alone constituted the good. Multiple Aristons thus appear at key moments in Greek intellectual and political history, giving the name a genuine cumulative weight in the classical record.
In the contemporary world, Ariston remains rare in English-speaking countries, functioning as a name for those drawn to classical antiquity or Greek heritage. It carries the authority of a name that has never needed reinvention — it meant "the best" when it was coined, and it means exactly the same thing today, with two and a half millennia of distinguished usage behind it.