The functionality to make it possible to change the name of an O365 tenant, especially with Sharepoint Online in mind, is being planned. There is no ETA at this time though.
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I have 3 onedrive business on 1 laptop. All the freaking same name! Why can't i change this? Or why it doesn't take the business email adress from the OneDrive account you use? Instead of just the first business email adress i ever used. It is 2020 for god sake.