I am unable to rename items in my guildhouse without placing them in my inventory first. I also am not able to put things in a pouch without first moving them off my guildhouse into my inventory, it just always says please wait a few seconds.
So for example, if I wanted to name a pouch in my guildhouse"Techs" and the pouch already has techs in it I would first have to move all the techs to my inventory, since you can't move a pouch that contains objects, then move the pouch, rename the pouch, put it back, then refill it.