Alpawıt (Alpağıt) is an ancient Turkic term, that had a similar meaning with batır and probably was derived from "alıp". In 6th-13th centuries alpawıt was a chief of military units, especially of guard. In Khanate of Kazan and Qasim Khanate this term was used for the highest military rank. But since 16th-17th centuries Tatars used this term for their landowners.
References
Alpawıt Wikipedia(Text) CC BY-SA