I'm working on adding a custom culture for a little minimod I'm making and while most of the names are simply names some of the names in the cultures.txt files are written with an underscore inbetween them. Like Mark_Marcus, for example. I assume this is to allow for alternate spellings and still keep the correct dynasty numbers but I'm wondering how this works. Is the first part the displayed name and the second the part that is checked by the game engine against other names or vice versa?