Can this function be done with names rather than IDs?

This question already has an answer here:

How can I select an element by name with jQuery? 15 answers

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Of course - using the attribute selector - and perhaps take the first if there are more.
NOTE: Name is not a valid attribute of a DIV - now I see you are cloning divs in your fiddle

 var cloneCount = 1;
 $("button").click(function(){
   $('input[name="name0"]').eq(0) // only that one
      .clone()
      .attr('name', 'name'+ cloneCount++)
      .insertAfter($('[name^=name]:last'))
      .text('name ' + (cloneCount-1)); //<--For DEMO
 });

If you need them to have the same name you could do

 $("button").click(function(){
   var $q = $('input[name="question"]').last();
   $q.clone().insertAfter(q);
 });

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