This article is focused on research of interaction and interpenetration of Christian and archaic mythologies and revealing of beliefs’ traits of another folks in the etiological legends concerning Moon spots. To solve this problem the following issues are considered to systematization and classification of the complex of etiological legends concerning Moon spots; detection of archaic origins and Christian elements presented in the Moon spots legends; comparative analysis of Belarusian Moon spots legends with such legends of other folks to show genesis and relations of some legends. We used for analysis this sources: ethnographic material from the 19th and 20th century, digital Polesie archive, “field”-materials collected by the author and another researchers in 2005–2008. As a result we show that some Moon spots legends could migrate to Belorussia region from Poland, Russia and Lithuania. Also archaic origins in the legends were revealed.