Finally, I have decided to delete my account. But as someone said my questions will still be there, but with a greyed out name.
I am thinking of changing my profile name to something which is most widely used so that it becomes difficult track my questions.
Something like SAM perhaps. Is there any query which I can execute to get that?
EDIT: someone told me that my last username stays there, so you mean it will always be "Please delete me" as per the FAQ?