How Do I change my last name in my quickbooks online account?

Welcome to the Community, bcvu-custom.

Let’s sort out your concern about changing your last name in QuickBooks Online (QBO).

We can access your QuickBooks Online (QBO) account and navigate to the Intuit Account Management page to change your data. With this, you can update your account and alter your last name.

Here’s how:

1. Log into your QuickBooks Online account using a web browser.
2. Go to your Profile beside the gear icon.
3. Click the Manage your Intuit Account.
4. From the left panel, select Personal info.
5. From there, update your last name and click Save.

I also added a snapshot for your visual reference.

Learn how to manage your QuickBooks Online subscription, whether you need to examine your billing history, change the card that is already on file, or update the card that is currently used: Manage billing, payment, and subscription info in QuickBooks Online

Let me know if you need further assistance with altering your company information. The Community always got your back. Have a great day!