So Ran into Two Troll Jokers on Balmung Server

[Raikki]

I recognize the names from Titan PUGs but I don't recall them acting like tards. Maybe they save it for the relative anonymity of cross-server DFs.

[Kakure]

The server community has very little ability to punish misbehavior, but you could report the name Johannes Kepler.

Section 3.5 of the FFXIV:ARR terms of service specifically forbids the use of "any name or other intellectual property belonging to Square Enix or any other third party in your use of the Game (for example, naming a character after a celebrity, company, product, or superhero)."