Distinctively Persian personal names survived Islamization as markers of retained identity

Evidence

In the Fertile Crescent and westwards, the names that parents gave their children were mostly names from the Qur’an or from pagan Arabia— ‘Ali, Muhammad, Ahmad, and the like. These names were also used in Iran among Muslim Persians. But in addition, they used distinctively Persian names: Khusraw, Shapur, Mehyar and other names derived from a Persian past—a recent Persian past, that of the Sasanids, but nevertheless Persian. — Bernard Lewis, From Babel to Dragomans, 285