Another way

Question

Is "Qué es tú nombre?" also a valid way to ask what is your name?

Accepted Answer

Hola Michael,
I am afraid not. Questions using "Qué es..." are asking for a definition of something, for example:
-¿Qué es "paella"? -Paella es un plato de comida típico de Valencia.
When we ask what someone's name is we are not expecting a definition, we expect a direct answer with a name. The confusion comes normally from the use of "what" in English, which is "qué".
I hope this clarified it. 
Have a look a this lesson on uses of qué when asking.
Saludos
Inma

Answer

The preferred question word to use is "which"... "Cual es tu nombre?"

Answer

Yes because it is asking what is your name.