ǃXu, also ǃXu꞉ba and sometimes ǃXo or ǃXo꞉ba, is a San rendering of the Khoikhoi word ǃKhu 'rich' and its derivation ǃKhub 'rich man, master', which was used by some Christian missionaries to the Khoikhoi to translate the word "Lord" in the Bible. Bleek reports that the ǂKxʼaoǁʼae rendered the word as ǃXo and the Naro as ǃXu꞉ba or ǃXo꞉ba when repeating things what the Khoikhoi had told them. It has entered the Juǀʼhoan language as the name of the Christian god.
- Dorothea F. Bleek, Bushman Dictionary, p. 502, at Google Books. ISBN 9785882327261
- "Planetary Names: Crater, craters: Xu on Rhea". Gazetteer of Planetary Nomenclature. International Astronomical Union (IAU) Working Group for Planetary System Nomenclature (WGPSN). Retrieved 20 November 2014. CS1 maint: discouraged parameter (link)
- The Compact NASA Atlas of the Solar System, p. 401, at Google Books Cambridge University Press, 2001. ISBN 9780521806336