The name "Earth" is derived from both English and German words, 'eor(th)e/ertha' and 'erde', respectively, which mean ground. But, the handle's creator is unknown. One interesting fact about its name: Earth is the only planet that wasn't named after a Greek or Roman god or goddess.
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In Italian Earth is Terra... And in Spanish it's Tierra.
Buuuut there you go.
Did you even think before posting this?