Because they were historically diarchies
Khazars had Beg and Khagan, Bulgars (at least Danube Bulgars) had Kanasubigi and Kavkhan (this title is considered to be possibly hereditary and held by members of the same family)
Magyars had Gyula and Kende, Avars had Khan and Jugurrus. Well actually we may do without with the last one considering we don't have and likely won't ever get 769 start, but Khazars exist in two bookmarks, Danube Bulgars exist in 867 and rebelled several times after 1018/9 and kavkhans were part of these revolt like kavkhan Georgi Vojteh's rebellion in 1071 and while it disappeared very early from Magyars, when they migrated to Pannonia they were a diarchy.
Khazars had Beg and Khagan, Bulgars (at least Danube Bulgars) had Kanasubigi and Kavkhan (this title is considered to be possibly hereditary and held by members of the same family)
Magyars had Gyula and Kende, Avars had Khan and Jugurrus. Well actually we may do without with the last one considering we don't have and likely won't ever get 769 start, but Khazars exist in two bookmarks, Danube Bulgars exist in 867 and rebelled several times after 1018/9 and kavkhans were part of these revolt like kavkhan Georgi Vojteh's rebellion in 1071 and while it disappeared very early from Magyars, when they migrated to Pannonia they were a diarchy.
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