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 About Disputed ethnic origin of persians 

The papyri from Tebtunis record several sites in the Fayum, which appear to have been founded as ethnic communities in the third century BCE. These include the ""Village of the Syrians"" (Syrôn kômê), ""Village of the Arabs"" (Arabôn kômê) and Samareia, which contained a sizable Jewish population and was probably named after the city in Palestine. 

Although ethnic designations like Boeotian, Macedonian, Syrian, Arab and Jew probably refer to geographic origin, ""Persian"" proves problematic. Its precise origin or significance is disputed. In the early Ptolemaic period it seems to describe people with Greek names functioning in a Greek context; although they enjoy a privileged status, they are counted separately from Greeks in tax lists. In late Ptolemaic and Roman contracts, ""Persian of the epigonê"" refers to the legal status of a debtor who had waived certain personal rights in order to secure the collection of a debt.

Persians 
6 June 12 BCE
 
In this Demotic contract, summarized in Greek at the bottom, Pakemis son of Pakemis, acknowledges the loan of the dowry of his wife Tameische (Greek, Tameischis), daughter of Sokonopis, and promises to repay it. Here ""Persian"" does not seem to indicate descent, but describes a man with the status of a debtor. In this example, the subject has an Egyptian personal name, but ""Persian of the epigonê"" is just as frequently used to describe people with Greek names.

P.Tebt. II 386
(http://tebtunis.berkeley.edu/lecture/clar_ex2.html)
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