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Good day, aleksander_2011.
Thanks for posting your concern in the Community.
The company name of your book depends on how you want to name it. With that said, you can enter anything that you are comfortable to use.
You can modify the name of your company anytime you want to. The steps below will guide you through on where you can enter the company name:
To know more about the company settings, you can check out this article.
Please know that I am here to help you more in case you need further assistance in adding your information in QuickBooks Online. Take care!