Guido Scialfa

Show Sites ID’s in a network installation into the following locations:
<ul>
<li>Admin Bar</li>
<li>Admin Menu</li>
<li>Network Sites Table List</li>
</ul>

Network Site ID

Show Sites ID's in a network installation.

Jose Manuel Sanchez

Network Site Names lets you add custom site names to be shown in the admin bar menu. Site names can be used to identify each site with a different name while using the same Blog Title in the front end. This is useful for Multilanguage or Corporative networks where many sites may need the same title.
This plugin is so small and simple that it can be installed as a <a href="https://codex.wordpress.org/Must_Use_Plugins" title="Must Use Plugins" rel="nofollow ugc">Must Use Plugin</a> without having to worry about updates. Read the Installation section for instructions.

Network Site Names

This plugin lets you add custom site names to be shown in the admin bar menu.

Network Site ID vs Network Site Names