"devicename" would be the name of the file in /dev/ that refers to the disk, which has no relation to the volume name you can see in the Finder. Also, /dev/ is not only invisible in the Finder, but also inaccessible in the Finder. The files in /dev/ can only be found with terminal command ls. Such a file could have a name like "disk2s2".
Another possibility may be to add a disk that is mounted in OSX to the volumes list in BasiliskII like this:
where "volumename" is the name of the volume you see in the Finder.