QML FontLoader.name confusion
This is not an ideal solution, but a workaround that should work. There's an open-source font editor called FontForge that you can use to change the names that Qt reads. Open the font files in question and then open the menu Element->Font Info. That opens a dialog with multiple tabs on the left. The first tab should be PS Names. This should list several fields including Fontname and Family Name. You should be able to edit those to whatever you want. Then close that dialog and use File->Generate Fonts to regenerate the .ttf files.