I’m have changed a customer name but the invoices are still showing the old name?

Hello, info1560. 

I'll ensure your invoices are able to use the new customer's name. 

The Display name as in the customer's profile might be using the old name. This is the reason why the invoices are showing the old one. 

In this case, edit the Display name as field then use the new name. This will also update the information on your existing invoices. Here's how to do it: 

1. Go Sales, then click the Customers tab.
2. Click the customer's profile.
3. Click Edit. 
4. Set the Display name as to the new name.
5. Click Save. 

Check the invoices and ensure they are now using the new name. 

If you need more help editing your customers and their information, you can check this article for reference: Edit customer information.

Looking to run reports to show how much you've earned so far? You can run sales reports or the Profit and Loss statement. If you need help running or building a report, you can read this guide: Run reports in QuickBooks Online. 

I'm always here to help out other users in the Community forums. Just ask away if you have more concerns about QuickBooks Online.