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Ato using Kanji 跡 can also mean trace, track, mark. Which fits the definition better.

When I saw this word I first thought of "ashi-ato" (footprint). I think the word was probably made to evoke this meaning.

I thought of 傷跡 kizuato, which means "scar", but literally "remains of a wound". So watashiato as "what remains of me" seems to make sense.