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No idea! But in English, one synonym for Earth could be Soil or Ground, and another could be World, so I don't find it surprising.

I am confused by the question: there are a lot of synonyms (words with approximately the same denotation) in almost every language. They often have different histories: and the same is the case here. avani originally came from a root meaning to drive, and ila from a root meaning to flow, and via meanings like course and stream bed came to mean ground in general.