That's not an accidental match of the names or finding "doppelgangers" somewhere, it's intentionally making doppelgangers - these "spoiler" candidates literally changed their name before the elections, one of them was born as Viktor Bykov and the other was Alexei Shmelev. The only thing they can't legally change is the patronymic, which a key part of the name in Russia and differentiates the names of these three candidates.