The history of Iranian last names is quite interesting. While many Iranians have adopted Western-style last names, there are still many who cling to traditional Persian naming conventions. In ancient Iran, last names were not used in the same way as they are today. Instead, people were identified by their father's name or tribe. For example, if someone's father was named Darius, his son would be called Darius the Younger.
It wasn't until the Sassanian Empire (224-651 CE) that last names began to be used more regularly. At this time, Iranians were
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