Chebyshev and Russian transliteration
It's not simple to transliterate Russian names to English. Sometimes there is a unique mapping, or at least a standard mapping, of a particular name, but often there is not. An example that comes up frequently in mathematics is Pafnuty Lvovich Chebyshev (1821–1894). This Russian mathematician's name Пафну́тий Льво́вич Чебышёв has been transliterated at Tchebichef,