What's your name?

My name is Siti Rohimah. What is your name?

Name /neim/  is a Noun, that is why it uses the question word 'what' in a question and not 'who.
#  Is your name Siti Romlah?
 -  No, it is not.
#  What is your name?
- My name is Siti Rohimah  (or  It is Siti Rohimah)

Here are some other Nouns:
-  First name
-  Middle name
-  Surname
-  Last name
-  Nickname
-  Nationality
-  Native language
-  Age
-  Weight
-  Hight
-  Sign
-  Cell phone number
-  Address
-  Favourite colour
-  Favourite sport
-  Job
-  Hobby

Those they are listed and all the rest of nouns have got the same way/form
 in the question (interrogative):

• Is your name Siti Romlah? 'No, my name is not Siti Romlah.'
• What is your name?  ' My name's Siti Rohimah.'
• Is your sign Sagittarius?  'No, it isn't.'
• What's your hobby?  'It's reading.'

And to form the negative sentence;
We just add  'Not'  after  is:
- My name is not Lisa
- Her favourite colour is not pink
- His native language isn't Sundanese. His native language is Bantenese Javanese



Short form

- What's    is  the short form of   what is
- It's                                                 It is
- They're                                         They are
-  isn't                                               is not
-  aren't                                             are not