I'm assuming you meant that going the opposite way.
rock is too ambiguous of a tag for that. And it seems it's already in use as a tag for the object.
Posted under General
I'm not sure on the overall stance in regards to nicknames, but in at least the case of Kasuga_Ayumu (not surprised if most are going "who?", I know I did) we favored using the full name despite her being called Osaka pretty much throughout the entirety of the series.