Hi there. 

In order for Customer Names to appear on Receipts, you'll need to turn on the "Order Ticket" feature in the "Printer" section of your Square Register app. 

Once this is turned on you can choose to enter each customers name before check out. This will appear on both the Order Ticket as well as your customers Printed Receipt. 

You can use this feature with Squares Customer Directory so that you can quickly add customers names to sales.