JSFiddle - React, Tailwind, and code Playground

HTML

<div class="modal-body" client-name="test1">
    <input class="gform_hidden"/>
</div>
<div class="modal-body" client-name="new name">
    <input class="gform_hidden"/>
</div>
<div class="modal-body" client-name="test3">
    <input class="gform_hidden"/>
</div>

JavaScript

$('.modal-body').each(function() {
		  var cname = $(this).attr('client-name');
		  $('input.gform_hidden').val(cname);
		});