Just to say an example: Dark Sister: The Valyrian steel longsword wielded by Visenya Targaryen. The last known owner was Bloodraven.
Dark Sister was not a Sister its still a swords name. Somebody may be called Dark Sister like in a satanist temple or something
But in that context, its a sword.. Same with this spectre as well. At first i was thinking about the scepter meaning as well but hey its cool how it is. There are bigger problems than naming an item xy's ghost or staff