Identifying Yourself With Names Other Than The Given Name
There’s no harm in choosing pen names, stage names, nick names, or other such names to identify oneself as long it’s not done for a deceitful purpose, and there’s no other immoral aspect involved. Even prophet Muhammad SAW’s given name was Ahmad. Muhammad was his nick name (kuniyat). He was also known by the titles (laqab) of Sadiq and Ameen.