array(
 [0]=>
  object(stdClass)#631 (7) {
    ["value"]=> 153,
    ["name"]=> "elem1"
  }
  [1]=>
  object(stdClass)#632 (7) {
    ["value"]=> 1700,
    ["name"]=> "elem2"
  }
  [2]=>
  object(stdClass)#633 (7) {
    ["value"]=> 100,
    ["name"]=> "elem1"
  }
)

foreach($results as $res){
    $naw_arr[$res->name] += $res->value;
}

Undefined index: elem1