Rename a local and remote branch in git

rename_git_branch.txt

1. Rename your local branch.
  If you are on the branch you want to rename:  git branch -m new-name
  or If you are on a different branch: git branch -m old-name new-name

2. Delete the old-name remote branch and push the new-name local branch.
  git push origin :old-name new-name

3. Reset the upstream branch for the new-name local branch.
  Switch to the branch and then: git push origin -u new-name

reference Rename a local and remote branch in git