Anonymous User Reviews add-on for WP Rich Snippets plugin allow you to accept reviews from anonymous so that their name and email are not published. To be precise, it makes the name and email input form optional, so that the user does not have to fill these details and can submit review anonymously.
1.4.4 | Sep 25, 2018 @ 9:38 am
This is the EXACT same plugin as distributed by the developer on WP Rich Snippets. The developers’ links are provided above.