What is XXX's brothers name?
Juqu Mujian
Juqu Mujian (Chinese: 沮渠牧犍; before 420 -- 447), named Juqu Maoqian (沮渠茂虔) in some sources, formally Prince Ai of Hexi (河西哀王), was a king of the Xiongnu state Northern Liang--with most Chinese historians considering him the last king, although with some considering his brothers Juqu Wuhui and Juqu Anzhou to be kings of the state as well.
Juqu Wuhui Juqu Anzhou