The Nùng (pronounced as noong [nuːŋ]) are a Central Tai-speaking ethnic group living primarily in northeastern Vietnam and southwestern Guangxi. The Nùng sometimes call themselves Thổ, which literally means autochthonous (indigenous or native to the land). Their ethnonym is often mingled with that of the Tày as Tày-Nùng. According to the Vietnam census, the population of the Nùng numbered about 856,412 by 1999, 968,800 by 2009, and 1,083,298 by 2019. They are the third largest Tai-speaking group, preceded by the Tày and the Thái (Black Tai, White Tai and Red Tai groups), and sixth overall among national minority groups. They are closely related to the Tày and the Zhuang. In China, the Nùng together with the Tày are classified as Zhuang people. There are several subgroups among the Nùng: Nùng Xuồng, Nùng Giang, Nùng An, Nùng Phàn Slình, Nùng Lòi, Nùng Cháo, Nùng Quý Rỉn, Nùng Dín, Nùng Inh, Nùng Tùng Slìn etc. Many of the Nùng's sub-group names correspond to the geographic regions of the Nùng homeland. Hoàng Nam (2008:11) lists the following Nùng subgroups. Nùng Inh: migrated from Long Ying Nùng Phàn Slình: migrated from Wan Cheng Nùng Phàn Slình thua lài Nùng Phàn Slình cúm cọt Nùng An: migrated from An Jie Nùng Dín Nùng Lòi: migrated from Xia Lei Nùng Tùng Slìn: migrated from Cong Shan Nùng Quý Rỉn: migrated from Gui Shun Nùng Cháo: migrated from Long Zhou The Zhuang, Nùng, and Tày people are a cluster of Tai peoples with very similar customs and dress known as the Rau peoples. In China, the Zhuang are today the largest non-Han Chinese minority with around 14.5 million population in Guangxi Province alone. In Vietnam, as of 1999, there were 933,653 Nùng people and 1,574,822 Tày people. Recently the Tày and Nùng have been referred to as a combined Tày-Nùng minority. However these ethnonyms are a recent phenomenon and did not exist until the modern age. According to Keith Taylor, the Vietnamese terms were "categories of French colonial knowledge" used to differentiate highlanders from lowlanders.