A longstanding folk tradition among rural Russian peasants, ulichnye familii (‘street surnames’) were used by Doukhobors colloquially ‘on the street’ of a village to distinguish among families sharing the same official surname. Similar to Quebecois dit names and Scottish sept names, ulichnye familii arose because of the low surname stock within Doukhobor society. Passed down to succeeding generations and transferred between settlements, these names became a recognized form of address among Doukhobors, helping structure kinship networks and organize social interactions among villagers. When a large contingent of Doukhobors emigrated from the Caucasus to the Canadian prairies in 1899, they continued this naming practice in their settlements well into the early 20th century. A ubiquitous part of their culture for generations, today ulichnye familii have all but disappeared among Doukhobors, as a result of their assimilation, dispersal and modernization. This article offers an analysis of the Doukhobor anthroponymic custom of ulichnye familii: the social factors leading to their adoption; the etymological processes through which these names were formed; the manner in which they were used and transmitted; and the elements contributing to their eventual decline and disuse. It also includes an inventory of extant ulichnye familii among the Doukhobors of the Caucasus and Canada, obtained through extensive fi eld interviews and archival research.