There isn't any evidence that Mulan is based on a real person. But the Mulan, as imagined in the original source material, Ballad of Mulan most likely has Xianbei origin.

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📚SOURCES:
Mulan: Five Versions of a Classic Chinese Legend, with Related Texts, 2010, Shiamin Kwa & Wilt L. Idema.
From Tribal Confederation to Empire: The Evolution of the Rouran Society, July 2005, Kradin Nikolay
Clarification on the location of Yan Mountain (Khangai)
http://old.pep.com.cn/xiaoyu/yuwenboo...
English Translation of the Ballad of Mulan:
https://en.wikisource.org/wiki/Transl...

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