If you really want to get names right, you'll provide the ability to configure the name used in each context, while perhaps providing an option to do one or more standard conventions (e.g., first/middle/last) and derive uses automatically from that.

But it's not clear to me what your real priorities are: these lines imply quite different priorities:

> If there are employees there who have edge case names in this paradigm, they can try their best to conform to this standard. [...] I've personally never met someone who had a different name standard that wasn't met by the first/middle/last convention

> It’s important for my software to get names right because it sends out emails and messages on the users behalf.