1998: After 70 years of getting by on first-name terms, Mongolians resorted to using three names – given name, patronym and clan name. The communist government had banned clan names in the 1920s; Mongolians owed their allegiance to the state, the authorities had said, not to their clan. All change in the post-communist 1990s: Mongolians were instructed to resume using their old clan names or, if they couldn’t remember them, to adopt new names. Many chose Borjigin, the clan name of Genghis Khan.
Source: Ian Jeffries, Mongolia: A Guide to Economic and Political Developments (2007), pp. 19–20