Jupiter's Galilean satellites were named Io (Io), Europa (Europa), Ganymede (Ganymede) and Callisto (Calisto). Before the 20th century, these names were not popular and were replaced by titles such as "Io", "Europa", or "Jupiter's first satellite". These names did not come into widespread use until the 20th century, while the remaining newly discovered moons have yet to be named and are given Roman numeral numbers V (5) through XII (12). Callisto, which was discovered in 1892, was first named Amalthea by the French astronomer Flemaryen. It was unofficial but very popular.
Until the 1970s, astronomy used Roman numerals for satellites. In 1975, the International Astronomical Union (IAU) gave names to Io-13 and provided a formal naming procedure for later discovered moons. The rule is: the name of the newly discovered satellite must be the lover and favorite of the god Jupiter (Zeus). Since 2004, the naming rules have been extended to the descendants of the above figures. The satellites after Jupiter were named after daughters of Jupiter or Zeus.
Some asteroids have the same names as Jupiter's moons: 9, 38, 52, 85, 113 and 239. The International Astronomical Union has permanently renamed two asteroids (Asteroid 1036 and 204) to avoid conflicts.