The Lan (Chinese: 蘭) tribe was one of the five member tribes of the old Xiongnu people who lived during the Han Dynasty in Northern Wei.
History
The old Xiongnu people had five tribes: Luandi (攣鞮), Suibu (須卜), Huyan (呼衍), Lan (蘭), and Qiulin (丘林). According to the Chinese assimilation policy of Xiaowen, the Xiongnu Chinese of Lan (蘭) get the surname Lan (蘭). Their families are part of the Liu (劉) family of Han Zhao.
References
Lan (tribe) Wikipedia(Text) CC BY-SA