I want to create a user name class

I use nifty mBaaS.I would like to manage the data by using the class name as each user name.Therefore, I wrote the following code to make the class name the user name who is logged in.

var currentUser=NCMB.User.current();
varName=currentUser.get("userName");

varName=NCMB.Object.extend("Name");
var name = new Name();

The class name will be Name.How can I name the class with the name of the logged in user?