Mu is the pinyin romanization of several Chinese surnames.
Mù (穆) was listed 98th on the Song dynasty list of the Hundred Family Surnames.[1][better source needed]
Mù (牧) was listed 225th on the Song dynasty list of the Hundred Family Surnames.[1][better source needed]
Mù (慕) was listed 329th on the Song dynasty list of the Hundred Family Surnames.[1][better source needed]
There are also surnames Mù (木), Mǔ (母), Mù (目), Mù (沐), Mù (睦) and Mù (暮), which are not in the Hundred Family Surnames list. Among Hui people, Mu is a sinified version of Muhammad together with Ma.[2]