<input type="radio" id="name" />
<input type="radio" id="name" />
<input type="radio" id="name" />
<input type="radio" id="last" />
<input type="radio" id="last" />

<input type="radio" id="name1" />
<input type="radio" id="name2" />
<input type="radio" id="name3" />
<input type="radio" id="last1" />
<input type="radio" id="last2" />

$('[id]').each(function(){
  var ids = $('[id="'+this.id+'"]');
  if(ids.length>1 && ids[0]==this)
      $(this).attr('id', $(this).attr('id') + i);
 });