ogmrip (last release in 2015, not available in any major repository)
Old app icon names or not used:
Thunar (use org.xfce.thunar for Xfce 4.16 on)
org.xfce.xfmpc (uses multimedia-player in its .desktop file) Renamed a few of these symlinks to gtkpod since that one was missing some sizes (though gtkpod should probably use its own app icon and not a device icon)
These names have been replaced by FreeDesktop.org Icon Spec names, I could find no place where these old names are still used:
https://specifications.freedesktop.org/icon-naming-spec/icon-naming-spec-latest.html
Apps no longer developed:
Old app icon names or not used: