Daulat Khel is a subtribe of Baizai Bangashes.
Bai Khan, their reputed ancestor, is said to have had a son, Daulat Khan, and the tappa is often named Daulat Khel after him - Daulat Khel and Baizai being almost synonymous terms.
[1] This article about a Pakistani ethnicity is a stub.
You can help Wikipedia by expanding it.