For each company in Business Central, there is a Name and a Display Name field.
To find the list of companies in your Business Central, use the Search and look for the page "Companies":
Caution: If you change the "Name" (which will ask whether you are sure you want to rename) this can break the connection used by other apps such as PowerBI reports connected to the related company.
When connecting your data with outside apps and sources, the Company "Name" is what is important.
For information with regards to changing the company display name, see https://docs.microsoft.com/en-US/dynamics365/business-central/ui-change-basic-settings#to-change-the-company-name