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WordNet records no synonym and no antonym for eponym. It is the only member of each of its synsets, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
the person for whom something is named
“Constantine I is the eponym for Constantinople”
the name derived from a person (real or imaginary)
“Down's syndrome is an eponym for the English physician John Down”
Synonyms, antonyms and the broader and narrower relations for eponym come from Princeton University’s WordNet. Full sources and licences.