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by justsomehnguy 902 days ago
Petrov/Petroff is a (a very common) surname/lastname in Russian, but never a firstname.

-ko is a suffix denoting a lastname of Ukrainian origin though those were spread around even in Russian Empire.

There are a lot of people with Zayilenko surname in Russia now and Zalenko and Zelenko is still one in Ukraine now.

Given the Wikipedia article on him there is a chance it's just a corruption and he was called Petro Zelenko

[0] Petrov "Petro" Zailenko, a.k.a. Pitro Zalenko