The Bulgars (also Bolgars, Bulghars, Huno-Bulgars) were a semi-nomadic people who flourished in the Pontic Steppe and the Volga basin in the 7th century. Ethnically, the Bulgars comprised Turkic and probably Scytho-Sarmatian elements. They had enveloped also other ethnic groups by their migration westwards across the Eurasian steppe.

The Bulgars emerged after the collapse of the Hunnic Empire in the 5th century. Initially, they conquered the Pontic-Caspian steppe and around the lower Volga basin, by the 7th century dispersing further towards Bessarabia. Originating as nomadic equestrians of Central Asia, they became sedentary during the 7th century, establishing the polities (khanates) of Old Great Bulgaria in the Pontic steppe and Volga Bulgaria on the middle Volga.

Old Great Bulgaria was absorbed by the Khazar Empire in the 8th century, but in the 680s, Khan Asparukh conquered Scythia Minor, opening access to Moesia, and established the First Bulgarian Empire, which was however Slavicized by the 10th century. Volga Bulgaria preserved their national identity well into the 13th century by repelling the first Mongol attacks in 1223. But they were eventually subdued, and their capital Bolghar city became one of major cities of the Mongol Golden Horde. Later, Volga Bulgars mixed with Tatars of Kazan.

The Chuvash people (Chuvash: Чăвашсем; Russian: Чуваши) are a Turkic ethnic group, native to an area stretching from the Volga Region to Siberia. Most of them live in Republic of Chuvashia and surrounding areas, although Chuvash communities may be found throughout all Russia.

There is no universally accepted etymology of the word Chuvash. However, there are two main theories that try to explain it.

According to one theory, "Chuvash" is a Shaz-Turkic adaptation of Lir-Turkic Suvar, an ethnonym of people that are widely considered to be the ancestors of modern Chuvashes. Compare Lir-Turkic Chuvash: huran to Shaz-Turkic Tatar: qazan (cauldron).

Another theory suggests that the word "Chuvash" may be derived from Common Turkic jăvaš ("friendly", "peaceful") as opposed to şarmăs ("warlike").

There are rival schools of thought on the origin of Chuvash people. One is that they originated from a mixing between the Turkic Suar and Sabir tribes of Volga Bulgaria with local Mari tribes and also the Finno-Ugrian population of the Volga Basin. Another is that the Chuvash are a remainder of the pre-Volga Bulgar population of the Volga region, merged with Scythians, Volga Bulgars and Mari.