Yeah, Spiritcaller is used on pet stuff as a prefix: jewellery and staves. You have Beastcaller's, Spiritcaller's, Summoner's, Invoker's, Ritualist's and Puppetmaster's. Looking at that list I would guess that Beast Brand was probably going to be a pet one too, but dropped.
Bone Shiv I'd guess was maybe going to be a weapon, but dropped, since there are Bone Shiv's in GD.