[рони]

Dark Souls,

<script>
function fn(obj, num) {
  return Object.keys(obj).reduce(function(a, b, i) {
    i = i / num | 0;
    a[i] ? a[i][b % num] = obj[b] : a[i] = {0:obj[b]};
    return a;
  }, {});
}
;
var d = {}; //для примера
for (var i=0; i<50; i++)  {d[i] = {"name":"Vsya"}}
document.write(JSON.stringify(fn(d, 5)))
</script>