Al-Sijistani
Al-Sijistani (Persian: سجستانی and السجستانی) refers to people from the historic Sijistan region in present-day Sistan, the border region of eastern Iran and southwestern Afghanistan. Prominent people who have been called Al-Sijistani include:

Abu Da'ud Sulayman ibn Ash`ath al-Azadi al-Sijistani (817-888 CE), ("Abu Dawūd"), collector of hadith
Abu Yaqub Sijistani (died c. 971 CE), Neoplatonist and Ismaili missionary
Abu Sulayman Muhammad al-Sijistani (c. 932 - c. 1000 CE), Islamic philosopher, flourished in Baghdad
Al-Sijzi (c. 945 - c. 1020 CE), mathematician and astronomer
Masʽud ibn Muhammad Sijzi, 14th-century Persian physician
Amir Hasan Ala Sijzi Dehlavi (1242-1325 CE), Indo-Persian poet, scholar and Sufi