JSFiddle - React, Tailwind, and code Playground
by Castrolol
HTML
<div id='c'>
<iframe width="465" height="285" frameborder="0" allowfullscreen="true" src="http://www.youtube.com/embed/7KS8KGGTpkI?wmode=transparent&vq=hd720"></iframe>
<p>aksfasjfksalfsfsjkf</p>
<h3>asfasdfasdfasfas</h3>
<iframe width="465" height="285" frameborder="0" allowfullscreen="true" src="http://www.youtube.com/embed/7KS8KGGTpkI?wmode=transparent&vq=hd720" name="test1"></iframe>
</div>
JavaScript
var t = $("#c"); //Getting the container of iframes
var iframesWithoutName = $("iframe",t).not("[name]"); //Getting the iframes without name
$(iframesWithoutName).attr("name", "newName"); //setting the name