QBO Error: The product name already exists in your QuickBooks Online account.

This error is usually associated with the customer's name having the same entry in QuickBooks Online. QBO has a limitation that requires each customer to have a unique name. For example, In QBO there's a customer named Customer A, if another Customer A is be synced from QuickBooks Commerce, QBO will not allow it. To resolve, edit the name on either platform so that it's unique.