Jovian comes from Latin Iovianus, meaning 'of Jove' or 'belonging to Jupiter.'
Jovian is the adjectival form of Jove, the archaic Latin name for Jupiter, chief deity of the Roman pantheon — ruler of sky, thunder, and law, the Roman counterpart to the Greek Zeus. The name thus carries one of the oldest and most august lineages in Western naming tradition, rooted in the Proto-Indo-European *dyew-, meaning the shining sky or heavenly light, a root shared with the Sanskrit deva and the Greek theos. To be named Jovian is, etymologically, to be named for the god of gods.
In history, the name was borne by a Roman Emperor: Flavius Jovianus, known as Jovian, who ruled the empire for a mere eight months in 363–364 AD. He succeeded Julian the Apostate after Julian's death in battle against the Sassanid Persians, and his short reign was notable for negotiating an unpopular peace treaty that ceded Roman territory in Mesopotamia. History has treated him as a transitional figure rather than a consequential one, but the name survived him with its grandeur intact.
In the modern scientific lexicon, "jovian" describes anything relating to Jupiter or Jupiter-like gas giant planets, so the name carries an additional astronomical resonance in an era when space exploration has captured popular imagination. As a given name in the twenty-first century, Jovian is rare enough to feel genuinely distinctive without being obscure. It fits naturally among parents drawn to classical Roman names like Julius, Maximus, or Aurelius, but with a celestial overtone those names lack. Its linguistic link to the adjective "jovial" — which itself derives from Jupiter, as people born under that planet were thought to be cheerful — gives Jovian a quietly optimistic secondary meaning: the bright, good-humored one.