now I understand what you need, I have an email addy with my first initials and last name, which will not change no matter what first name I use, I just changed the name people see on the other end when they get my emails
but, I have one with my male name in the email addy, I cannot change that with out getting a whole new addy, which wont work because its for business use
a couple freebie emails I use have no names in the addy so I just changed what others see when they get mail.