MemoryTale
Good with a stick
I think it's fine personally, I do it myself with a character who's a policeman. When he's on the job he's Inspector Lambert, or just Lambert. When he's off, he's just Derek and none of my beta-readers have complained.
GonkTheInsane also did it in his books, the main character is called Tol but another character decided he should be called Steven, and that's how he's always addressed in her viewpoint chapters. I never found it confusing for the reader.
Also, also it can be used for dramatic effect like in Neil Gaiman's Anansai boys. It's very subtle but the character known as Fat Charlie is always addressed as such in the text, until a specific point when he's just Charlie. And, no, it's not after joining Slimming World
GonkTheInsane also did it in his books, the main character is called Tol but another character decided he should be called Steven, and that's how he's always addressed in her viewpoint chapters. I never found it confusing for the reader.
Also, also it can be used for dramatic effect like in Neil Gaiman's Anansai boys. It's very subtle but the character known as Fat Charlie is always addressed as such in the text, until a specific point when he's just Charlie. And, no, it's not after joining Slimming World