is ''What'' also a Subject?
What is your hobby?
What is your name?
Coco, "what" is the subject complement, not the subject, in those questions. Proof of this is that the answer to "what" will usually appear after "is" in the reply:
- My hobby is collecting stamps. (More natural than "Collecting stamps is my hobby.")
- My name is Gustavo. (More natural than "Gustavo is my name.")
As a result, the reported versions of those questions would be:
- He asked me what my hobby was.
- He asked me what my name was.