Read this: The most common Persian word is Masīhī (مسیحی), from Arabic.,Other words are Nasrānī (نصرانی), from Syriac for "Nazarene", and Tarsā (ترسا), from Middle Persian word Tarsāg, also meaning "Christian", derived from tars, meaning "fear, respect".

From which language is the least common term derived?
What is the answer? (If it cannot be answered, return "unanswerable")
unanswerable