That's the English transliteration. Don't forget that other Slavic languages also transcribe according to their own rules. For example in Czech, Валерий would

That's the English transliteration. Don't forget that other Slavic languages also transcribe according to their own rules. For example in Czech, Валерий would be transliterated as Valerij because "j" is pronounced in Czech as English "y" in "you".