There are two ways to update the account name shown in your Dashboard:
Update the account name in Account Settings
In your Dashboard, click on the name of your current Stripe account in the upper-left corner, then click "Edit"
If you have multiple Stripe accounts, you can only edit the account you're currently viewing in the Dashboard.
Changing your account name will not change what your customers see on their bank statements. Read more: Update business name shown on customer bank statements