Git tip: Renombrar usuario de uno o varios commits.
git filter-branch --commit-filter '
if [ "$GIT_COMMITTER_NAME" = "<Old Name>" ];
then
GIT_COMMITTER_NAME="<New Name>";
GIT_AUTHOR_NAME="<New Name>";
GIT_COMMITTER_EMAIL="<New Email>";
GIT_AUTHOR_EMAIL="<New Email>";
git commit-tree "$@";
else
git commit-tree "$@";
fi' HEAD