This kind of customization will need to be done by creating a custom translation file for your install. In your copy of the language file, you can call the “Name” field to be whatever you want it to be. The following documentation explains how you can create a translation file:
The custom fields will appear where we show it in the example screenshots on this page:
You can order the custom fields so show them in a certain order. However, they can’t be moved to another place in the payment window.