Action or script to prompt to add to layer name

Hi all,

Can anyone let me know if it's possible to create a script or action to prompt for a word to be entered, then add that name to all layers, or specific layers, or replace a specific word if it exists in layers.

e.g. I'm creating a template with generate image assets enabled so I can quickly and easily generate a predefined set of image sizes / formats etc. just from dropping the image into a smart layer.

That's all sorted and working - but I'd like to be able to specify the filenames based on the main image rather than having to rename layers individually and manually.

So I'd have 

Template Names                  Saved layer names

50x50.jpg                              New Logo 50x50.jpg

50x50.png                             New Logo 50x50.png

1000x1000.png                     New Logo 1000x1000.png

So rather than having to add "New Logo" or whatever the filename needs to be based on the project, I could just enter it once and then they get updated?

I hope that makes sense!

Fingers crossed