"Remember, it's spelled N-E-T-S-C-A-P-E but it's pronounced: Mozilla, the Mosaic Killer Godzilla".
some sources: http://fredericiana.com/2007/04/15/mosaic-killer/
> it was internally named Mozilla (Mosaic-Killer, Godzilla) by Jamie Zawinski
https://en.wikipedia.org/wiki/List_of_company_name_etymologi...
> Mozilla Foundation – from the name of the web browser that preceded Netscape Navigator. When Marc Andreessen, co-founder of Netscape, created a browser to replace the Mosaic browser, it was internally named Mozilla (Mosaic-Killer, Godzilla) by Jamie Zawinski.[110]
Protections that would apply to -zilla as you suggest could be used for a lot else by other corporates, so be careful what you wish for there.
But on the other, if we're calling ownership over the '-zilla' suffix then a certain giant monster might take precedent.
But as long as there is low risk of confusion it is not infringement. I could probably start a lepidopterist consulting firm named Amazon.