Fan Chuo,
Translation:Manshu — Chapter 4
“ Rationale is as follows: historically the character 羌 was used not to denote a modern ethnic identification, but "the term 'Qiang' denoted only non-Han people living in the upper Min River Valley and Beichuan area, the area now occupied by the modern Qiang." (Wikipedia, Wikipedia) . The prefix 大 (meaning large/great) is often used for reasonable sized empires or political confederations. It would feel a more tortured interpretation in this list to include the two characters 大羌 within the name of the individual, particularly given the nominal title-like prefix already commonly present, 楊. ”

