Parsa (English spelling)

Japanese: Pārsa（英語表記）Parsa

…An alternative name for Iran that has been used mainly in Europe and America. It originally came from the name of a region in southwestern Iran under the Achaemenid Empire, Pārsa (which remains in modern Persian as the Arabized Fars), but with the unification of the Iranian plateau by the Achaemenid Empire, the concept was expanded to include the whole of Iran. Persis, used by Greek historians during the Achaemenid period, entered Europe via the Latin form Persia. …

From the Persian Empire

…They were then in the southwest of Lake Urmia (Rezaye), but then moved south through the Zagros Mountains and settled in the Anshan region of Elam in the first half of the 7th century BCE. This area was later called Pārsa (Greek Persis, Latin Persia) after them, in what is now the Fars Province. …

From Persepolis

…the capital of the Persian Empire. Persepolis was the Greek name, and its ancient Persian name was Parsa. The ruins are now called Takht-e Jamshid (meaning "the Throne of Jamshid").

*Some of the terminology explanations that mention "Pārsa" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…おもに欧米で用いられてきたイランの別称。もともとはアケメネス朝が拠ったイラン南西部の一地方名パールサPārsa(現代ペルシア語ではアラビア語化されたファールスFārsとして残っている)に由来するが，アケメネス朝のイラン高原統一によってイラン全体を含む概念に拡大された。アケメネス朝期のギリシア史家の用いたペルシスPersisが，ラテン語形ペルシアを経て，ヨーロッパに入ったものである。…