Dugu (獨孤) is an extremely rare Chinese compound surname of Xianbei origin. There is also a small Korean population (Namwon Dokgo clan) with this surname (stylized as Dokgo or Tokko (독고) in Korean); many of them are found in North Korea, mainly in Ryongchon County and Uiju County near the Chinese border. During the 6th century the Dugus were a powerful aristocratic family based in northwest China. They are best remembered today by the Dugu sisters, whose marriages linked the imperial families of 3 successive dynasties — the Northern Zhou (557–581), Sui (581–618), and Tang (618–907). Shimunek (2017) reconstructs Tabgach *dʊqʊ which underlaid Chinese transcription 獨孤, which was glossed as 劉 "battle-axe". Source: Wikipedia (en)