So, this has nothing to do with copyright law. The word "Kik" is not a creative literary work. It is a registered trademark though:
http://tmsearch.uspto.gov/bin/showfield?f=doc&state=4804:lir...
I don't think there's a problem with trademark law here, I doubt that their claim is legally enforceable against the name of an npm module, as it's pretty obviously outside the goods and services which their mark is registered for. The problem is that npm are capitulating to what I suspect is an invalid request. As is often the case, people are scared of lawyers and forget that they have rights.