I think the devs dont like the song ‘Rudolph the red nosed reindeer’ 
Lets stop joking: I really dont understand the filter. Way to much normal words seems to be banned for no reason at all. Even some common strategy names of the game are banned. I wanna explain the Persian Douche to my enemy, but i couldnt say that word. I also dont know why.
Devs think this issue is solved. They alrady closed the thread:
The filter is still bad. I would say: Make a new bug report about it.
I think they ban everything with f k i n g in the name. I cant say f k i n g without the spaces in between on this board. That rule makes your name ‘invaled’ to display into the game. You name ends with does letters