How to get the registered sidebar’s name by its id?

Sidebars are stored in global variable $wp_registered_sidebars. You can get the sidebar properties using this variable.

global $wp_registered_sidebars;
if ( isset( $wp_registered_sidebars['sidebar-2'] ) ) { 
    echo $wp_registered_sidebars['sidebar-2']['name'];
}

Note that do not use it too early, either on/after widgets_init hook
or in a template file.

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