Diana is the name of the Roman goddess of the hunt, the moon, and wild nature — the Roman counterpart to the Greek Artemis. The name derives from the Proto-Indo-European root *dyew, meaning "bright" or "sky," the same root that gives "day" and "divine."
Diana Spencer, Princess of Wales (1961-1997), gave the name its modern global resonance. It remains in continuous use across the West. Today Diana sits in the U.S. top 200.
Diana reduces to one — the number of singular brightness.