The work continues the series of publications on the Cheboksary regional dialect of the Russian language. This study examines Russian surnames of Chuvash origin as a feature of the speech of residents of Cheboksary. The material for the study was surnames common in the Chuvash Republic. The work is based on a qualitative analysis of factual material. Chuvash surnames have undergone significant qualitative changes over the past three centuries from the original eastern Tatar-Islamic tradition to the modern Christian one. The surnames of Cheboksary residents cannot be a marker of the Cheboksary regional dialect of the Russian language. In general, Cheboksary surnames, due to their simple denominal origin, can be understood as a generalizing marker. The combination of Orthodox-conditioned denominal surnames such as Ivanov, Petrov, Fedorov with Chuvashism surnames such as Sadyrga, Yakku, Mulgachev, Kashkarov creates a unique anthroponymic background for the functioning of the Cheboksary regional dialect, reinforcing the impression of its qualitative parameters. The Christian foundations of the Chuvash nomenclature go beyond the anthroponymic dictionary: in modern conditions, almost all names in the Chuvash environment are oriented towards the Russian tradition. Russian-Orthodox names largely form the Russian visual landscape of the region.