Jason Lau

This plugin simply adds custom user meta keys when a user registers an account.

Add User Meta

This plugin simply adds custom user meta keys when a user registers an account.

Applelo

This plugin improves the admin users search. Just configure what datas you need to search (or not) and that all 🙂 
You can choose to configure what default wordpress search (login, url, email, nicename, display_name) and extends search with user metas (last_name, first_name…).
Free tip: this plugin do more sense with <a href="https://wordpress.org/plugins/codepress-admin-columns/" rel="ugc">Admin Columns</a> 😉

Add User Meta vs Better Admin Users Search