Looking on the internet deeply has found these results:

What is your name? is the most popular phrase on the web.

what your name? 129,500,000 results on the web	What is your name? 152,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
What's your name? Parker. Rocket. Sorry, I forgot to introduce myself. What's your name? What's your name?	Wait, what is your name? What is your name? Anouk. Lyubava. Marcie. What is your name? Can I? Would you? What is your name? Gwen. What is your name? Servant, what is your name?

what your name?

129,500,000 results on the web

What is your name?

152,000,000 results on the web

More popular!