An affiliation can be misleading if its apparent geographical meaning is taken as a complete biography. A label alone does not establish an individual's birthplace or permanent residence.
Khālid ibn Makhlad al-Qaṭwānī is also identified as a Kufan. His case illustrates why an unusual nisba should be checked against biographical reports instead of treated as conclusive evidence of origin.
When a surprising nisba occurs, first establish its precise form, then investigate its historical explanation and the person's other identifiers. Such checks help prevent the merging or duplication of transmitters.