Ok, this is just a (very) little suggestion, I did emerge git and was ambiguos, so I thougth that a rename can be appropriate
Incidentally, ruby-git is exactly what the upstream project is called...
The gem is called git. See https://rubygems.org/gems/git We won't rename it. Please use cat/pkg format to avoid former ambiguosities. In this case it would be: emerge dev-vcs/git