Analysis of information sources in references of the Wikipedia article "Fars province" in English language version.
The name of Fārs is undoubtedly attested in Assyrian sources since the third millennium B.C.E. under the form Parahše. Originally, it was the "land of horses" of the Sumerians (Herzfeld, pp. 181-82, 184-86). The name was adopted by Iranian tribes which established themselves there in the 9th century B.C.E. in the west and southwest of Urmia lake. The Parsua (Pārsa) are mentioned there for the first time in 843 B.C.E., during the reign of Salmanassar III, and then, after they migrated to the southeast (Boehmer, pp. 193-97), the name was transferred, between 690 and 640, to a region previously called Anšan (q.v.) in Elamite sources (Herzfeld, pp. 169-71, 178-79, 186). From that moment the name acquired the connotation of an ethnic region, the land of the Persians, and the Persians soon thereafter founded the vast Achaemenid empire. A never-ending confusion thus set in between a narrow, limited, geographical usage of the term—Persia in the sense of the land where the aforesaid Persian tribes had shaped the core of their power—and a broader, more general usage of the term to designate the much larger area affected by the political and cultural radiance of the Achaemenids. The confusion between the two senses of the word was continuous, fueled by the Greeks who used the name Persai to designate the entire empire. It lasted through the centuries of Arab domination, as Fārs, the term used by Muslims, was merely the Arabicized version of the initial name.
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