Illarionov, Ilarionov (; masculine) or Illarionova, Ilarionova (; feminine) is a common Russian surname originating from the masculine given name Hilarion. The surname is shared by the following people: Anastasiia Illarionova (born 1999), Russian handball player Andrey Illarionov (born 1961), Russian economist Dimitri Illarionov (born 1979), Russian classical guitarist Ivaylo Ilarionov (Bulgarian Cyrillic: Ивайло Иларионов; born 6 January 1973) is a retired Bulgarian association football
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