The tribal ethnonym Daii is formed from the demonstrative pronoun for 'this'.
In Norman Tindale's estimation the Daii occupied 800 square miles (2,100 km2) of land, extending northwards from the shores of Blue Mud Bay as far as the Koolatong River. Their inland extension ran at least to Ngilipidji.
The Daii consisted of two clans, which formed the basis for marriage exchanges:-
The Dalwangu moiety was jiritja, the Djawark a dua moiety.
The Daii's lands accessed the rich quartzite quarry at Ngilipidji, which provided stone for prized implements that could be traded. The local industry was, according to archaeologists, probably spurred by the rise of precolonial contacts with Asia'sSouth Sulawesi Makassar voyagers.
- Hiscock, Peter (2007). Archaeology of Ancient Australia. Routledge. ISBN 978-1-134-30440-0.
- Tindale, Norman Barnett (1925–1926). "Natives of Groote Eylandt and the west coast of the Gulf of Carpentaria, Parts I-II". Records of the South Australian Museum. 3: 61–102, 103–134.CS1 maint: date format (link)
- Tindale, Norman Barnett (1974). "Daii (NT)". Aboriginal Tribes of Australia: Their Terrain, Environmental Controls, Distribution, Limits, and Proper Names. Australian National University Press. ISBN 978-0-708-10741-6.
- Warner, W. Lloyd (April–June 1931). "Morphology and Functions of the Australian Murngin Type of Kinship (Part II)". American Anthropologist. New Series. 33 (2): 172–198. doi:10.1525/aa.1931.33.2.02a00030. JSTOR 660835.