النَّسَفِيّ
A person associated with Nasaf.
A nisbah can identify a place, tribe or intellectual association. Here it refers to Nasaf, described in the note as a town in the region of Turkistan and also associated with the name Nakhshab.
Examples:
Al-Bukhārī — associated with Bukhara.
Al-Samarqandī — associated with Samarkand.
Al-Nasafī — associated with Nasaf.
A geographical designation does not, by itself, establish the person's entire intellectual affiliation or level of scholarship. Their teachings and writings must be considered separately.