Ermián / Erh-mien
The provided source explicitly records Er Mian (爾綿) as a historical compound surname of the Dai region and states that it is included in the Zheng Tongzhi's Clan Records; the material does not restrict it to a Han Chinese surname.
The source says that the origin is not uniform: one account connects the surname, represented by the Rouran chief Er Mian Tabai, with the Rouran people; another says that Er Mian was originally the name of a Rouran tribal group and became a surname from the tribe.
The historical figure listed by the source is Er Mian Tabai, identified as a Rouran chief during the Northern Wei period.
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