Gah, I think its pretty much up to people individually - one takes things disruptive others dont.. "Plank"
has meaning IRL
as well, and I am not sure if calling my next char "Table" would be as fine.
Tomahawks are referring to real life cultures pretty much off setting, I agree here, I wouldnt allow that either - but again I see it like with calling yourself "Queen". Both I consider equally unacceptable, but obviously its only about povs of people in charge. If you can call yourself Queen, and arent even trying to make it look like you mean it in a whole new definition (because "Queen" does mean to Yliakums people as much as "Zradiddlratafl"), why not using Tomahawk, but DO give it a meaning all new?
I am aware of GMs dont have an easy task there, hence I am explicitly not trying to oppose, but to encourage people to just try to claim names of their taste!