naming policy rules... what are they?

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This all needs to be codified. Having some "if I feel like it" name changing guide running around with his own unwritten laws is one hell of a slippery slope and your players are going to hate you for it. I mean, this guy is apparently getting his name changed because the German guide is offended by the player's use of "German" words. Since there are no clearly stated naming rules, in this case the guide (expressly) changed the name (literally) out of German nationalism. The irony is so thick it's actually hurting my teeth.