Albert Barnes Commentary Ezra 5:6

"The copy of the letter that Tattenai, the governor beyond the River, and Shethar-bozenai, and his companions the Apharsachites, who were beyond the River, sent unto Darius the king;" — Ezra 5:6 (ASV)

Apharsachites, like Apharsites, and Apharsathchites (Ezra 4:9), are thought by some to be forms of the word “Persians,” which is applied here generally to the foreign settlers in Samaria. (Others identify the first and the third names with the “Paretaceni,” a people on the Medo-Persian border.)