Good question, no one know that for sure but at least there are slightly controversial historical theories, results of various genetic researches and etnographical results.
As well it is a tricky question how close the relationship is between the population and the language.
The current position states that ungarians are relatives of Finns and Esthonians and are originatd from a territorry west from the Ural mountains. They are originated form Europe however they speek a definitely non-Indoeuropean language.
The Hungarian remembrance and tradition holds the Huns, the Avars as their predecessors, as well some smaller nations joined the Hungarian tribes which formed it's origin of conciousness very much(Jazigs, Pechenegs, Baskirs, Kuns, Kabars).
LAter on extremely much nations joined or at least mixed with Hungarians rusulting the today known nation to be formed(Croats, Serbs, Romanians, Jews, more kind of German people, Slovaks, Rusines) as well with smaller other additional collocation with smaller influence(Greeks, Armenians, Turkish people, Bulgars).
You must not forget about the biggest minority that considers himself normally as Hungarian but in fact they aren't: the Gypsies. Tey are as well not 1 tribe or 1 nation, however via their unique race-marks they can be really distinguished from the native Hungarians.
Finally Hungary is the biggest mixture of white people.
The possessive form for the proper noun Magyar is Magyar's.Example: The Magyar's origin is believed to be Asia.
The Magyar, or Hungarians, are from Hungary.
László Magyar died in 1864.
Ede Magyar died in 1912.
Ede Magyar was born in 1877.
Magyar Szó was created in 1944.
Lajos Magyar was born in 1891.
Lajos Magyar died in 1937.
Magyar Nemzet was created in 1937.
The City of the Magyar was created in 1840.
Magyar Rádió was created in 1925.
Magyar Cserkészszövetség was created in 1912.