The notion that "boxies" and "swampies" and such are IC slang seems strange to me. It's adorable and all, but I don't think I've ever met a real live human being who would even consider using baby-talk to discuss all manner of life-threatening creatures, objects, and situations.
I know I can't stop it, but it drives me nuts. "Puff" is another one. You know what? It doesn't sound even remotely like the word "empath"! Something must be done. :)
As far as names, so that I'm on-topic... I tried to choose "Uhura" and they told me I couldn't have it, and then within 15 minutes or so of rerolling so I could pick a new name, I swear I ran across about seven people whose names were words like "Picklesticks" and "Hoorayforme" or similarly asinine garbage. Geez, at least "Uhura" is a real name. And I totally didn't even think of Star Trek until they told me I couldn't have it...

P.S. "Boxies" isn't even a good nickname! It's longer than the real word! Argh.

Terms like Gob and Swampy are fine. People have always given short, funny-sounding names to their enemies--The Japanese were Japs in WWII, the Germans were Krauts and the Soviets were Reds.

Look up some of the European slang for gypsies--gyppos and pikeys are just a few.

Bigoted abbrevations are just as unfortunate IG as they are IRL. :) (Yes, I am largely kidding.)

Goblins are people too! I'm going to start some kind of campaign...