Show Advanced Custom Fields field name on Wordpress admin on hover

acf-field-names.gist.php

//In functions.php

add_action('admin_head', 'show_acf_field_names');

function show_acf_field_names() {
  echo '<style>
    body:not(.post-type-acf-field-group) .acf-field:hover:before {
  content: attr(data-name);
  display: inline-block;
  position: absolute;
  background: #FFF;
  padding: 0 3px;
  border: 1px solid #CCC;
  font-size: 9px;
  right: 0;
  left:auto;
  z-index: 10;
  height: 20px;
  width: 70px;
}
  </style>';
}