The article analyses the forms of Christian names used in the past and in the present on the territory of the Karelian ethnic group’s settlement — in Finland, as well as in Russian Karelia, Tver and Leningrad regions. The main aim of the article is to sum up the findings of previous research and to provide an analysis of new anthroponymic data retrieved from the 16th–17th centuries historical documents or collected by the author and other researchers during field trips. After outlining the main stages of the development of the Orthodox religion on the Karelian lands, the author gives an insight into the history of the formation of the Karelian Orthodox anthroponymicon. The article shows that after the adoption of Orthodox religion in 1227 K...