How do I write a named arrow function in ES2015?

I have a function that I am trying to convert to the new arrow syntax in ES6. It is a named function:

function sayHello(name) {
    console.log(name + ' says hello');
}

Is there a way to give it a name without a var statement:

var sayHello = (name) => {
    console.log(name + ' says hello');
}

Obviously, I can only use this function after I have defined it. Something like following:

sayHello = (name) => {
        console.log(name + ' says hello');
    }

Is there a new way to do this in ES6?