Al-Khaṭīb authored a substantial book on this subject (1) which he entitled “Abridgement of the Look-Alike Names” (2). He then appended a supplement to it (3) covering what had escaped him in the first edition (4), and the work is highly beneficial (5).
(From this category, together with the one that preceded it, several sub-types may be derived:
Among them is a case in which agreement—or confusion (6)—occurs in both the personal name and the father’s name, for example, save for the difference of one or two letters (7) or more, whether in one of the names or in both.
This particular case (8) itself falls into two divisions:
(9) either the variation lies in substituting letters while the total number of letters remains unchanged (10) in both names, or the variation involves substitution along with the omission of some letters in one name as compared to the other.)