His name is Magna.

Translation

This book, written by Abu Naeem Al-Isbahani, deals with mentioning those who bear the name of a group of follower narrators, explaining their biography and narrations about the Companions. It focuses on several people with the same name, each of whom has his place in the world of hadith and Islamic history, and mentions the stories that were told about them. The book is a type of hadith book that is concerned with documenting hadith narrators and their biographies.