WordPress user search plugins

Lava Ajax Live Search Provides Ajax live search for posts, custom post type in your WordPress site. It also works for BuddyPress, BBPress search

Improves the search for users in the backend significantly: Search for first name, last, email and more of users instead of only nicename.

Effortlessly find users in WordPress! Search by first & last name, username, or email.

Find posts, users, plugins, themes, media, comments, and, manage updates from a search bar. Works on the dashboard and frontend.

This plugin extends the default WordPress admin user search functionality in the search query.