They are the Prominent Hamlets (Qurā al-Ẓāhira)
Al-Imāma wa’l-Tabṣira min al-Ḥayra|Volume 1|Book 3|Chapter 15
سعد بن عبداللّه، عن علي بن محمد الرازي، قال: حدّثني نصر بن الصباح قال: أنفذ رجل من أهل بلخ خمسة دنانير الى حاجز، وكتب رقعة، وغيّر فيها اسمه، فخرج اليه الوصول باسمه ونسبه والدعاء له.
Saʿd b. ʿAbd Allāh, from ʿAlī b. Muḥammad al-Rāzī, saying that Naṣr b. al-Ṣabāḥ narrated to him, saying: “A man from the people of Balkh sent five dinars to Ḥājiz,[1] writing a note in which he altered his own name. The receipt came out to him with his name, his lineage and a supplication for him.”