Question: What was the original name for the region where Zarmihr Karen served as Sasanian governor?

Context paragraphs:
Bozorgmehr: Bozorgmehr-e Bokhtagan (Middle Persian: "Wuzurgmihr ī Bōkhtagān"), also known as Burzmihr, Dadmihr and Dadburzmihr, was an Iranian nobleman from the Karen family, who served as minister of the Sasanian emperor Kavadh I (498-531), and later as Grand Vizier under his son Khosrow I (reign 531–579), and then as "spahbed" under Hormizd IV.  According to Persian and Arabic sources, he was a man of "exceptional wisdom and sage counsels" and later became a characterisation of the expression.  His name appears in several important works in Persian literature, most notably in the Shahnameh.  The historian Arthur Christensen has suggested that Bozorgmehr was the same person as Borzuya, but historigraphical studies of post-Sasanian Persian literature, as well as linguistic analysis show otherwise.  However, the word "Borzuya" can sometimes be considered a shortened form of Bozorgmehr.

Zarmihr Karen: Zarmihr Karen (died 558) was an Iranian nobleman from the House of Karen, who served as the Sasanian governor of Zabulistan.  He was the son of Sukhra.

Burzin Shah: Burzin Shah, also known by the Arabicized form of Barzan Jah, was an Iranian nobleman from the House of Karen.  A descendant of Sukhra, he was the governor of Nishapur during the reign of the Sasanian king Yazdegerd III (r. 632–651).

Peroz III: Peroz III (Middle Persian: 𐭯𐭩𐭫𐭥𐭰 , <a href="Persian%20language">Persian</a>: پیروز "the Victor"; ) was son of <a href="Yazdegerd%20III">Yazdegerd III</a>, the last <a href="Sasanian">Sasanian king of Persia</a>.  After the death of his father, who legend says was killed by a miller for his clothes and jewelry (when the governor of Merv might have been the real culprit), he retreated to territory under the control of Tang Dynasty China.  He served as a Tang general and the head of the Governorate of Iran, an exiled extension of the Sassanid court.  Most of what is known of Peroz is written in the "Old Book of Tang" and the "New Book of Tang".

Iyas ibn Qabisah al-Ta'i: Iyas ibn Qabisah al-Ta'i was the Sasanian governor of al-Hirah from 602 to 617—he was the co-governor of the city alongside the Persian noble Nakhiragan.  They succeeded the last Lakhmid ruler of al-Hirah, al-Nu'man III ibn al-Mundhir, after he was deposed by king Khosrow II (r. 590–628).  Azadbeh succeeded them in 617.

Zarmihr Hazarwuxt: Zarmihr Hazarwuxt was a Sasanian commander from the House of Karen.  He was also the marzban of Persian Armenia during a short period in 483.

Narsi: Narsi or Narse (Middle Persian: 𐭭𐭥𐭮𐭧𐭩 ), was an <a href="Iranian%20peoples">Iranian</a> nobleman who served as the <a href="Sasanian%20Empire">Sasanian</a> governor of <a href="Ka%C5%A1kar">Kaškar</a>.

Phajja: Phajja were an all-female contemporary R&B trio that released two albums on Warner Bros.  Records and several moderately successful singles.  Its members are Kena and Nakia Epps, sisters from Chicago, and Karen Johnson, of Boston.  The ladies began singing together in 1987.  The group originally consisted of five members and the original name was "Not Your Average Girls".  The five ladies traveled and performed original music for several years before landing their first record deal with Capitol Records in 1991, however never released an album.  In 1993 the five ladies disbanded and Kena, Karen, & Nakia continued on, changed their name to "Phajja" and shortly after left Capitol Records and signed with Arista Records.  In 1995 Phajja signed with Warner Brothers Records.  Although having been signed to three major labels it was with Warner Brothers Records when they would release their first album "Seize The Moment"

Sukhra: Sukhra (also spelled Sufaray, Sufray, Surkhab, Sarafra'i) was an Iranian nobleman from the House of Karen, who was the "de facto" ruler of the Sasanian Empire from 484 to 493.  He was active during the reign of shah Peroz I (r. 457-484), Balash (r. 484 – 488) and Kavadh I (r. 488-496).  He is often confused with his father Zarmihr Hazarwuxt and son Zarmihr Karen.

Zabulistan: Zabulistan (Persian/Pashto: زابلستان ; "Zabul" + "-stan"), originally known as "Zavolistan", is a historical region roughly corresponding to today's Zabul Province in southern Afghanistan.  Zabulistan translates to "land of Zabul" or "land of the Zabuls".  The name "Zabuls" is probably a transliteration of Zunbils, a pagan dynasty that ruled the area during the Islamic conquest of Afghanistan.

Supporting paragraphs: Zarmihr Karen Zabulistan
Answer: Zavolistan