How To Display High Bidder Name
By default, with online bidding, only the high bid amount is shown to bidders (unless it is your bid).
An example of this would look like the following:
If you are signed in as a user for the organization you will see the details of the high bidder. An example using the same item as above would appear as the following:
To see the item as a bidder (who is not a "User") or as a visitor would, sign out of the auction event and/or use a different browser to access the page.
If you want to show the name of the high bidder to all bidders, change the Bidder identification setting under Online Bidding Behavior to "Bidder name is visible to everyone".