"Quién es 'Es'?" translates to "Who is 'Es'?"
The word "Es" is not a name, so this question doesn't really make sense in Spanish.
To make sense of this, we need more context. What is the situation you're referring to?
Here are some possibilities:
* Are you trying to ask about a person named "Es"? If so, the question should be "¿Quién es Es?"
* Are you asking about the meaning of the word "Es"? This could be "¿Qué significa 'Es'?"
* Are you referring to something else entirely?
Please give me more information so I can help you accurately translate your question.