In a well-known example, some of al-Bukhārī's chains give “Aḥmad” without a distinguishing attribution when the narrator transmits from Ibn Wahb. Two known possibilities are Aḥmad ibn Ṣāliḥ and Aḥmad ibn ʿĪsā.
The example does not mean one should pronounce a narrator weak merely because a short name appears. A named transmitter may be one of two identified teachers, and the lack of distinction may not itself damage the report when both are acceptable.
When exact identification matters, the critic compares other isnāds, hearing from Ibn Wahb, and al-Bukhārī's established naming practices.