Since Git version 2.11, git gui destroys the author name when 'git commit amend' is executed and the author name contains UTF-8-specific characters. This is a known issue from 'Git for Windows' and now a platform-independent bug. Please refer - https://github.com/git-for-windows/git/issues/761 - https://github.com/git-for-windows/git/issues/761#issuecomment-220792200 - https://github.com/git-for-windows/git/issues/761#issuecomment-266519859 >From my point of view, this is a severe error since the repostory is changed incorrectly. Users of git gui will usually not be able to correct this error with git commands.