Muḥammad ibn al-Sāʾib ibn Bishr al-Kalbī illustrates how one transmitter may appear under multiple labels. A chain may consequently seem to involve a different person when it actually names the same transmitter under an alternative designation.
The discussion includes forms such as “Ḥammād ibn al-Sāʾib” and the teknonyms “Abū al-Naḍr,” “Abū Saʿīd,” and “Abū Hishām.” Identifying aliases is not a declaration of reliability; it is a necessary preliminary to evaluating a narrator correctly.
Two questions remain separate: Who is this person? and What is the critical standing of this person’s transmissions? Resolving identity does not automatically settle reliability.