Is there a shortcut for renaming layers in Illustrator CC?
There isn’t one listed on Adobe’s Default Keyboard Shortcuts
If you hit alt+command+L you will get a new layer below the one you have selected, the advantage is that it displays the layer properties dialog box without having to click on the actual layer.
If you do Command+L then you only get a new layer, no dialog box whatsoever.
I mean, is not the ideal, but it has worked for me.