Could this title be about…identity? (Hint: yes, it definitely could.) Think of it as the response to a question: someone's asking "Who are you?" and our heroic protagonist responds, "I am Asher Lev." Asher is telling us who he is.
But why is it about identity? Well, because the book is. Chaim Potok takes us on the journey of one boy's quest to understand who he is, and to figure out the contradictory elements of himself that are sort of at war with each other: yeshiva student, artist, son, etc.