title: Get only unique names from more elements
body: <p>I have dynamically rendered HTML that lists an undetermined number of radio buttons whose names represent some ids in a database.</p>
  
  <p>I need to collect all of the unique names of the radios.</p>
  
  <p>Here is an example:</p>
  
  <pre><code>&lt;input name="721" type="radio" value="A" /&gt;        
  &lt;input name="721" type="radio" value="I" /&gt;     
  
  &lt;input name="722" type="radio" value="A" /&gt;        
  &lt;input name="722" type="radio" value="I" /&gt;     
  
  &lt;input name="723" type="radio" value="A" /&gt;        
  &lt;input name="723" type="radio" value="I" /&gt;     
  </code></pre>
  
  <p>Checking the radios is NOT required, so using a selected or checked attribute won't work.</p>
  
  <p>Is there an elegant way to get all the unique names of the radios using jQuery?
  I know I can just loop through each of the radios, but I'm hoping that jQuery has a more elegant way to do this?</p>