QB Issue Resolution:

There’s really not a way to delete a company, but to change its name is easy. All you have to do is click on the Gear icon in the upper right hand corner, then go into Company Settings. From there you can make all kinds of adjustments, including the company name.

Resolution for Issue 'How do you rename a Quickbooks Online company?' available: Yes (Solved).
Source: Intuit Community forum.

How do you rename a Quickbooks Online company?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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