I have been asking about this for a while too. I have written a couple of posts both on here and on Sketchucation. This is the most recent one:
https://forums.sketchup.com/t/component-names/59213/3
I’ll put a link at the bottom to a plugin I found that looks promising. Haven’t tested this on large libraries but it worked well for a batch of 20 component with sub comps too.