I was checking out the tags today, and I think we could clean up a couple tags. For all three suggestions, I think a synonym should suffice. I was unable to propose them, as version-specific tags can only be proposed by moderators.
I ran into a similar meta request for java-8 to be synonymized, and this is just an expansion.
For all three, I really agree with this clean up proposal.
Note: I chose python3 not python2.7 because it's the most recent language update. I'm not sure what to do about python2.7. Suggestions?