Earth is the only planet whose name in English is not derived from a Greco-Roman God.
April 22 is Earth Day. The English name, from the 15th century, for the planet we inhabit, came from the Old English eor?e, meaning both “ground, soil, dirt, dry land; country, the district” and “the material world, the abode of man”, which descended from the Proto-Germanic er? ?, from the Proto-Indo-European root er- (“earth”, “ground”).
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. From the Latin terra – with origins in the Proto-Indo-European ters-, meaning “dry” – the Romance languages derived their word for Earth, including the French La Terre, Italian La Terra, and Spanish La Tierra.