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In human languages, most translations of the Earth are just "the Earth", or "the World", or "the Land". Once in a while, you will find a proper name ("Gaia") of a God, or a reference to a God ("God...
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In human languages, most translations of the Earth are just "the Earth", or "the World", or "the Land". Once in a while, you will find a proper name ("Gaia") of a God, or a reference to a God ("God's House"). The same is probably true of the Sun; the sun is the sun, it is just a label everyone understands, and knows what it means. There doesn't have to be any deeper mythological reason. In all those cases, the planet is singular; they need a name to refer to a singular object, so it makes no difference what it is. Your name would need some mythological reason involving OTHER planets in order to distinguish THIS planet from them, some reason THIS planet is something as specific as "The Spear" and other planets are presumably named after other objects. Perhaps its role in an interplanetary war.