Earth, of course, is only one name for our planet. It comes from the Saxon, Ertha which in turn comes from the Teutonic Erda (which was a name for the Earth Goddess, the mother figure - hence Mother Earth). Other names for the planet include Terra (Roman Earth Goddess), Gaia (Greek Earth Goddess, also spelled Gea, and hence the origin of the prefix geo- as in geology). While the other planets got their names from the Roman pantheon, the Old English name for our world stuck.
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