Chuvash scholars claim that the Suars were a branch of the Sabirs who migrated to the Middle Volga region in the 8th century CE. It is well established that one of the major cities of Volga Bulgaria was called Suar or Suwar, and that this city formed the center for a sub-kingdom, the Suar Duchy.
Today, many Chuvash regard the Suars as their ancestors. (Chuvash: Сӑвар) In the Mari language modern Volga Tatars are called Suas; Chuvash also are known as Suasenmari or in Finnish language Suaslanmari (which means Suar-icized Mari.)
"Suars". Tatar Encyclopedia. Kazan: Tatarstan Republic Academy of Sciences Institution of the Tatar Encyclopaedia, 2002.