I'm running macOS High Sierra and just noticed a couple of these processes with an icon but no name. See screenshot below.
MacOS – this no-name item in Activity Monitor’s Energy tab
activity-monitorenergymacos
Related Solutions
I've confirmed this behavior as well on 10.10.4 on a MacBook Air. Drove me nuts until I came across this post confirming others are experiencing the same behavior.
Fortunately there is a workaround.
If Activity Monitor has been minimized to the Dock and you need to un-minimize it, click its Dock icon to bring the app to the foreground. Then, to actually reveal the Activity Monitor window, press Command-1. Command-1 is a keyboard shortcut listed in AM's "Window" menu purposed to give focus to the "Activity Monitor" window.
Alternatively, instead of minimizing AM to the Dock, you could hide it with Command-h. Unhiding by clicking AM's icon in the Dock doesn't appear to be an issue.
I know this is old, but this feature does exist: Go to Activity Monitor, click "View" (at the top) and select "All Processes, Hierarchically".
Hope this helps someone!
Best Answer
That could potentially be deleted apps, especially if you did a full delete of them (clearing caches/appdata/etc.).
Try to catch them running, so you can double click them to get more info.
If you aren't noticing any problems with your Mac's battery life, you can just ignore this.
Remember: High Sierra hasn't been out for very long, and is one of the buggiest release of Mac OSX to date. You may have to ask Apple Support if this continues to bother you.