In elementary school, my friends and I went through the "name changing phase." Although this phenomenon may not be documented in a child psychology textbook, it occurs in late elementary school or early middle school and may be defined as "the overwhelming desire to change one's name to one that's entirely different."
My babysitter went by her first initial; instead of being called "Jessica," she was called "J." In a similar vein, instead of being called "Sheila," I tried to go by "S."