I get frustrated when brands, products, and even more so OSS software projects, choose names that have too many other meanings/brands associated with them because it can make it unnecessarily difficult to find relevant information using current search engine technology[0]. I've had situations where I've been clicking through pages and pages of results to find something relevant to what I'm looking for, even with more qualified searches.
You can critique WhatsApp for any number of reasons, if you're so inclined, but it's hard to argue that they didn't pick a good name. It's eminently searchable and doesn't spam results pages for unrelated/tangentially related topics.
[0] I find names like "Signal" irritating for the opposite reason. You're searching for information about the other meanings and yet much of what you get is brand "spam" results related to the messaging system. Great if that's what you're searching for, not if it isn't.