A recent tradition
Like Turkey, Iran adopted fixed surnames relatively recently — mandated in the early 20th century. Many were formed from a father’s or ancestor’s name, a home city, or an admired quality.
The tell-tale endings
Persian surnames often carry a suffix that reveals how they formed: -i (a nisba, “relating to / from”) points to a person or place — Hosseini (“of Hossein”), Tehrani (“from Tehran”), Shirazi (“from Shiraz”); -zadeh and -pour/-pur mean “son of / born of” (Ahmadzadeh); and -nia / -nejad mean “lineage” or “descent.” Persian (Farsi) is a distinct language from Arabic, though the two share some names.