Different personal relationships may also produce matching forms of address. The kunyas Abū Ayyūb al-Anṣārī and Umm Ayyūb share the name Ayyūb, but this agreement does not merge their identities.
Similarly, when al-Rabīʿ ibn Anas narrates from an Anas, one must not assume from the wording alone that this teacher is the narrator’s father. The identity of the teacher must be checked in the chain’s biographical context.
Family ties, kunyas, and teachers’ names are different kinds of information. A verbal match raises an identification question; it does not settle it.