How do I change the name of a check transaction?

You can reopen the check transaction itself to update the name or any details. I'll guide you how, Chey.

Please follow the steps outlined below: 
 

1. Go to the Expenses panel.
2. In the Expenses tab, locate for the check transaction.
3. Click View/Edit in the Action column to open for the transaction.
4. Make necessary updates or changes on it. If you want to edit the Payee name, Date etc..
    
5. Tap Save and close.
   
    

You may consider adding transactions directly to an account register. I've added this article for reference: Manually Add Transactions to Account Registers in QuickBooks Online.

On top of that, QuickBooks Online (QBO) provides a wide range of reports to help you access the data you need. Simply apply filters to ensure you're getting the right information. For more details, take a look at this article: Customize Reports.
 

Did you know that our QuickBooks Live Expert Assisted team is available on demand to help you make the most of your expense and bank transactions? This ensures you always have a clear understanding of your business performance.

If you have any questions about check transactions or anything when updating the information let me know so I can help. I'd always be right here happy to assist you further.