This article explains how to find your Amazon registered business name within your Amazon seller central account.
You can find legal business name and address on Amazon via below steps:
Step 1
Login the Amazon seller central, below is the links:
Amazon seller central – North America: https://sellercentral.amazon.com
Amazon seller central - Europe: https://sellercentral-europe.amazon.com/
Step 2
Click Setting -> Legal Entity
Step 3
You can find the Legal business name