The conversations in TMDb should be in English.

Translation

not the correct name in Russian and there is no possibility to prescribe the correct one, since the field is locked

What is the correct name in Russian?
We need Cyrillic and Transliteration.
If there is a link on Wikipedia, please report it as well.

Nevermind. I found the Wikipedia page.
WIKI https://ru.wikipedia.org/wiki/%D0%9C%D1%83%D1%80%D0%B7%D0%B5%D0%BD%D0%BA%D0%BE,_%D0%9A%D0%BE%D0%BD%D1%81%D1%82%D0%B0%D0%BD%D1%82%D0%B8%D0%BD_%D0%92%D0%BB%D0%B0%D0%B4%D0%B8%D1%81%D0%BB%D0%B0%D0%B2%D0%BE%D0%B2%D0%B8%D1%87

The TMDb rule for people names, is to use the transliterated or romanized version.
In this case it seems to me correct.

as I understood it doesn't matter what language is default, but in any case

if I select en-US, I would like to see Konstantin Murzenko

if I select ru-RU, I would like to see Константин Мурзенко

but now I can't change it, and it is problem

Yeah, only the profile overview is part of the translation, not the name. That's why we have the rule mentioned by @ticao2 above.

@lineker said:

Yeah, only the profile overview is part of the translation, not the name. That's why we have the rule mentioned by @ticao2 above.

By the way, it will be cool to have it in dependent by the language. Is it possible to find a person by the Alternative Names?

@peshkov said:

Is it possible to find a person by the Alternative Names?

Do you mean by search?

not only search on the web, also using API requests

That I don't know. You could always ask in the API section.