A difference of even one letter can identify a different transmitter. The study of mutashābih therefore attends to dots, vowels, letter order, and additions or omissions in parts of names. Similar beginnings and endings do not warrant an unverified merger.
Application: Names with related graphic forms, such as “Muḥammad ibn Ḥunayn” and “Muḥammad ibn Jubayr,” demand comparison of students, teachers, and time before a person is selected. Visual resemblance triggers further inquiry; it does not establish identity.
Conclusion: when an unfamiliar name occurs in an isnād, resist silently replacing it with a familiar form. Resolve the reading through verified records and transmission evidence.