I just had a thought that it would be funny if they named spirits a la this scene from Parks and Rec

I'm just imagining two spirits on a mission with the names "Been There Done That" and "Currently Doing That"

One spirit just silently thanking their good fortune that they ended up with "Eagle Two"

I'd like to know who would be who if Mandrake's spirits did that.

Well depends on which book, I guess. I could imagine Prime Minister Devereaux being "It Happened Once In A Dream." I know he's not a spirit, but still.