I can't remember it, but I read one Microsoft blog post (in Vista era?) about how one team at Microsoft would develop some amazing new Windows component. They'd proudly name it AmazingNewService.dll. And then the operating system team would come in and say "that's all fine and good, but you have to conform to the naming convention." 8+3 filenames. First two letters probably "MS", because of reasons. ...and 15 years later, people still regularly go "What the fuck is MSAMNSVC.DLL?"
Rhowch, cwtch, mwyn have to be Welsh. Classicly Welsh sounding words, and mbrsrtowcs, strxfrm can't possibly be Welsh. Source: my welsh uncle taught me to pronounce Welsh place names.
Wcstold, wcsoll wmffre could be either but sound really weird as Welsh to me.
I prefer names like these to names that are common words. Even the name of the language is annoying because the letter C isn't exactly uncommon in other contexts. I can't blame the people who named the language because they did it long before search engines were a thing, but what excuse do people now have?