Woocommerce First Name = User First Name

I’ve created a registration form collecting Username, Email and Woocommerce shipping/billing address. Is there a way to have the billing First Name, Last Neme to automatically become the wordpress First Name, Last Name?

I’m already asking the customer to fill everything twice, shipping and billing name and address. Now to ask a 3rd time for First Last is really overkill. How could I avoid this?

PS: I need the wordpress First Name field filled so I can properly use %firstname% in notification emails. Or is there a way to pull the woocommerce first name field and use it in emails?