You forgot Slavs, Vlachs and Cumans.
Slavic element is the strongest amomg modern Hungarians. Before Magyars arrived to Hungary in 896 Slavs were majority in Pannonia, they were especially numerous in present day western Hungary. Magyarization of Slavs and other people in Pannonia was relatively fast. Regardless of that medieval Hungary had multi-ethnic caracter, because not all pre-Magyar people were magyarized.
After the creation of Austro-Hungary in 1867 magyrization was state project of Budapest in Hungarian part of empire. Even before 1867 magyriation happened, from the early 18th century. I tend to believe that more Slavic element was magyrized from early 18th cemntury to present day, than in the middle age.
Magyarization of Germans (Swabian) happened after 1918 after the disappearence of Austro-Hungary. Frerenc Puskas was magyarized Swabian. Father of Hungarian nation Lajos Kossuth was of Slovakian origin. Hungarian poet and revolutionar Sándor Petőfi was of Serbian-Slovakian origin
https://en.wikipedia.org/wiki/Sándor_Petőfi#Early_life
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