Hungarians, also known as Magyars ( ; ) native to Hungary () and historical Hungarian lands who share a common culture, history, ancestry and language. There are an estimated 9.6 million Hungarians live in today's Hungary. About 2 million Hungarians live in areas that were part of the Kingdom of Hungary before the Treaty of Trianon in 1920 and are now parts of Hungary's seven neighbouring countries, Slovakia, Ukraine, Romania, Serbia, Croatia, Slovenia, and Austria. Significant groups of people with Hungarian ancestry live in various other parts of the world, most of them in the United States, Canada, Germany, France, the United Kingdom, Chile, Brazil, Australia, and Argentina. Hungarians can be divided into several subgroups according to local linguistic and cultural characteristics; subgroups with distinct identities include the Székelys (in eastern Transylvania), the Csángós (in Western Moldavia), the Palóc, and the Matyó. Name The Hungarians' own ethnonym to denote themselves in the Early Middle Ages is uncertain. The exonym "Hungarian" is thought to be derived from Oghur-Turkic On-Ogur (literally "Ten Arrows" or "Ten Tribes"). Another possible explanation comes from the Old East Slavic "Yugra" ("Югра"). It may refer to the Hungarians during a time when they dwelt east of the Ural Mountains along the natural borders of Europe and Asia before their conquest of the Carpathian Basin. Prior to the Hungarian conquest of the Carpathian Basin in 895/6 and while they lived on the steppes of Eastern Europe east of the Carpathian Mountains, written sources called the Magyars "Hungarians", specifically: "Ungri" by Georgius Monachus in 837, "Ungri" by Annales Bertiniani in 862, and "Ungari" by the Annales ex Annalibus Iuvavensibus in 881. The Magyars/Hungarians probably belonged to the Onogur tribal alliance, and it is possible that they became its ethnic majority. In the Early Middle Ages, the Hungarians had many names, including "Węgrzy" (Polish), "Ungherese" (Italian), "Ungar" (German), and "Hungarus". The "H-" prefix is a later addition of Medieval Latin. The Hungarian people refer to themselves by the demonym "Magyar" rather than "Hungarian". "Magyar" possibly derived from the name of the most prominent Hungarian tribe, the "Megyer". The tribal name "Megyer" became "Magyar" in reference to the Hungarian people as a whole. The Greek cognate of "Tourkia" () was used by the scholar and Byzantine Emperor Constantine VII "Porphyrogenitus" in his De Administrando Imperio of c. AD 950, though in his use, "Turks" always referred to Magyars. This was a