I found the document containing dynamic civ names. I wanted to create some more for civs with relatively few dynamic names but I'm having trouble understanding with conditions the "tags" apply to. When I say "tags" I mean the text like "TXT_KEY_DN_EGY04". Is there a list of what conditions each tags apply to? Some are easier to figure out but some are pretty difficult.

Dynamic Civ names are implemented in the DLL, and you would have to modify and compile that to add new ones.

The relevant files are CvRhyes.cpp (CvRhyes.h sets up the matrix the names are stored in) and CvPlayer.cpp, which assigns names based on conditions.