JSFiddle - React, Tailwind, and code Playground

HTML

<script>
  var jack = 'jill';

  function window_getVarName(what) {
    for (var name in window) {
      if (window[name] === what)
        return (name);
    }
    return ("");
  }
  var name = window_getVarName(jack);
  document.write("name: " + name);

</script>