Sketch plugin to rename layers like a boss. It’s a port of the awesome photoshop plugin called Renamy

Rename Multiple layers at once. You can access it from the menu Plugins -> Rename It -> Rename Selected Layers or use the shortcut ⌃+⌘+R

Type “%N” to name layer in sequence. You can also use “%n” for reverse order. The more Ns you add the more digits it will add (e.g. , Item %N ==> Item 1, Item 2, Item 3). You can also set where to start the sequence from.

Type "*" to keep the original anywhere in the new name (e.g., Option * icon).

Type "%w" or "%h" to add the width or height of the layer (e.g., Icon %w x %h). Great addition by @GU5TAF

Type "%a" or "%A" (for uppercase letters) to name layers with letters alphabetically. (e.g., Item %a ==> Item a, Item b, Item c)

Combine keywords for renaming awesomeness

Find any text in selected layer(s) and replace it. This feature is CASE SENSITIVE. You can access it from the menu Plugins -> Rename It -> Find and Replace or use the shortcut ⌃+⌥+⌘+R