Rename a WordPress admin menu item without knowing its index (because they can change!)

class-admin-ui.php

<?php
// Note: it's not mandatory to put this in a class, it's just how I write my plugins
class Doublee_Admin_UI {

    public function __construct() {
        add_action('admin_menu', array($this, 'rename_menu_items'));
        // ...other function calls
    }

    /**
     * Rename some menu items
     * @return void
     */
    function rename_menu_items(): void {
        global $menu; 

        foreach($menu as $index => $item) {
            if($item[0] === 'Users') {
                $menu[$index][0] = 'User Accounts';
                break; // If you only have one change, stop here so there's no unnecessary iterations
            }
        }
    }
}