That's what I meant. If it's legal then I find it pretty insulting to not use the new name. If it's just a stage name it seems kind of fair for the gf to still use the real name privately

When you say changed your name, do you mean a full legal name change, or you use a stage name professionally but legally you still have your original name.

If it's the first, she needs to lear that the old name isn't your name and just because you have a different name doesn't mean you are a different person. If it's a name she doesn't like she can call you a nickname/petname privately and only if she's interviewed use you actual new name.

If it's the second then I can understand her calling you the old real name in private but in professional settings she should be using your professional name.

Not recognising the new name is disrespectful in either case. Not calling someone by the name they've asked to be called is disrespectful. The question is do you want to be living with and eventually marry someone who disrespects you everyday on such a fundamental way as not recognising your identity