By the way, the Bulgarians being of Iranic origins is new to me; at least, I've never heard of that theory before.]

From wikidedia
The Bulgars (also Bolgars or proto-Bulgarians[1]) were a seminomadic people, probably of Turkic descent[2], originally from Central Asia, who from the 2nd century onwards dwelled in the steppes north of the Caucasus and around the banks of river Volga (then Itil). A branch of them gave rise to the First Bulgarian Empire.