The TVTropes Trope Finder is where you can come to ask questions like "Do we have this one?" and "What's the trope about...?" Trying to rediscover a long lost show or other medium but need a little help? Head to Media Finder and try your luck there. Want to propose a new trope? You should be over at the Trope Launch Pad.
eroock
Since: Sep, 2012
Jerry
Since: Aug, 2013

In fantasy works, there's always a tendency for cultures to love using names like 'Steel Dragon' or 'Iron Hunters', even when steel and iron are really far down the fantasy metals list.
For example for Warhammer 40k, there are the Iron Warriors and Steel Confessors and such, despite how in-universe metallurgy has likely advanced so far that the regular Space Marine wouldn't even know what iron is.
In that context, naming something 'Iron' would be like us trying to name a mercenary company 'Zinc Warriors' or 'Plastic Eagles', and makes no sense for said fantasy culture to do so.
Do we have an existing trope for this?