All of the planets, except for Earth, were named after Greek and Roman gods and godesses. Jupiter,
Earth is the only planet whose English name does not derive from Greek/Roman mythology. The name derives from Old English and Germanic.
Sumerian astronomers named the sun, moon and five visible planets (Mercury, Venus, Mars, Jupiter and Saturn) after their great gods.
Most are named after Roman gods and goddesses. Roman mythology is to thank for the monikers of most of the planets in the solar system. The Romans bestowed the names of gods and goddesses on the five planets that could be seen in the night sky with the naked eye.
They include the sun (Surya), moon (Chandra), Mars (Mangala), Mercury (Budha), Jupiter (Brihaspati), Venus (Shukra), Saturn (Shani), Rahu (north node of the moon), and Ketu (south node of the moon).
Earth is the only planet in our solar system not named after a Greco-Roman deity. The name used in Western academia during the Renaissance was Tellus Mater or Terra Mater, the Latin for “earth mother”, i.e. “Mother Earth”, goddess of the earth in ancient Roman religion and mythology.
Jupiter was the King of the Gods in Roman mythology (counterpart of the Greek god Zeus), making the name a good choice for what is by far the biggest planet in our solar system.
Pluto is the only world (so far) named by an 11-year-old girl. In 1930, Venetia Burney of Oxford, England, suggested to her grandfather that the new discovery be named for the Roman god of the underworld. He forwarded the name to the Lowell Observatory and it was selected. Venetia Burney, the girl who named Pluto.
Venus was named after the Roman goddess of love and beauty. Mars was the Roman god of War. Jupiter was the king of the Roman gods, and Saturn was the Roman god of agriculture.
Being very cold and the farthest from the Sun, Pluto was named after the Roman god of death. According to Roman myth, when someone died, they traveled down to the Underworld. First, they had to cross the River of the Dead, called the river Styx.
For more than 1,000 years, when Hebrew speakers looked at the sky, they saw five planets - Hama (Mercury), Noga (Venus), Maadim (Mars), Tsedek (Jupiter) and Shabtai (Saturn). The five planets closest to earth all have ancient Hebrew names, some of them dating back to the time of the Talmud.
Most likely Earth was not named after a Greco-Roman god because it was not recognized as a planet in antiquity. The word planet means wanderer and the name Earth comes from the German word Erda and the Old English derivative of Erda, Ertha. In both languages it means ground. The ground doesn't wander.
The name Earth derives from the eighth century Anglo-Saxon word erda, which means ground or soil, and ultimately descends from Proto-Indo European *erþō. From this it has cognates throughout the Germanic languages, including with Jörð, the name of the giantess of Norse myth.
All of the planets, except for Earth, were named after Greek and Roman gods and godesses. The name Earth is an English/German name which simply means the ground. It comes from the Old English words 'eor(th)e' and 'ertha'. In German it is 'erde'.
In science
In several modern Romance languages, Terra or Terre is the name of planet Earth. Earth is sometimes referred to as "Terra" by speakers of English to match post-classical Latin astronomical naming conventions, and to distinguish the planet from the soil covering part of it.
Namesake. Jupiter, being the biggest planet, gets its name from the king of the ancient Roman gods.
Namesake. William Herschel tried unsuccessfully to name his discovery Georgium Sidus after King George III. Instead, the planet was named for Uranus, the Greek god of the sky, as suggested by Johann Bode.
Mars was named by the ancient Romans for their god of war because its reddish color was reminiscent of blood.
Zeus is a boy's name of Greek origin. This name is a mainstay in Greek mythology, belonging to the god of the sky and thunder. It even translates to “sky” and “shine.” Zeus rules as king of the gods in Mount Olympus and acts as patriarch to all the deities throughout the pantheon.
Zeus is the god of the sky in ancient Greek mythology. As the chief Greek deity, Zeus is considered the ruler, protector, and father of all gods and humans. Zeus is often depicted as an older man with a beard and is represented by symbols such as the lightning bolt and the eagle.
Odin, the All-Father
Described as an immensely wise, one-eyed old man, Odin has by far the most varied characteristics of any of the gods and is not only the man to call upon when war was being prepared but is also the god of poetry, of the dead, of runes, and of magic.
Hagar: The Woman Who Named God | Genesis 16, 21 | Women of the Bible.
It is a common misconception that “Terra” is the internationally-recognized scientific name of the planet, but in reality Earth does not have an official international name. The standard English name of the planet, including in science, is “Earth”.
The male planets are Sun, Mars, Jupiter, and Saturn; Mercury and Uranus are neuter; Moon, Venus, Neptune, and Pluto are female (though Pluto is related to Mars despite its Dark Mother feminine archetype).