BayБайmMedieval Russian Derived from the archaic Russian verb баять (bayat) meaning "to speak, to tell", which is ultimately derived from Church Slavonic bajati meaning "to speak, to talk, to tell, to narrate".
DawydДавыдmMedieval Russian, Medieval Ukrainian Medieval Russian and Medieval Ukrainian form of David. Dawyd Igorjewitsch (usually transcribed as Davyd Igorevich in English), the Prince of Volyn (1086–1099), was the son of Igor Yaroslavich and grandson of Yaroslav the Wise from the Rurikid dynasty of Kievan Rus’.
SofonСофонmMedieval Russian Russian variant of Sofoniya. Technically, this name can also be the Russian form of the ancient Greek name Sophon, but that particular etymology seems to be quite rare in the Russian context.