At times the similarity extends beyond one given name: a transmitter and his teacher may share several successive components of their names. Chains with patterns like “Aḥmad ibn al-Ḥasan ibn Aḥmad ibn al-Ḥasan” illustrate this problem.
Here the apparent repetition concerns a whole name sequence, not just one word. One must not delete or insert a link merely because the written pattern looks unusual.
Identification requires separate biographies, documented teachers and students, and the full form of each name as used in the particular transmission. Even extensive nominal similarity need not indicate personal identity.