It happens to me quite a lot: I create a branch and then want to rename it to a more specific/correct name.
If that branch has already been pushed to a remote, this operation is a bit trickier than the usual renaming.
git branch -m old_branch new_branch # Rename branch locally
git push origin :old_branch # Delete the old branch
git push --set-upstream origin new_branch # Push the new branch, set local branch to track the new remoteEnjoy!