let objName = ["object1", "object2", "object3"];
let xyzArr = ["xyz1", "xyz2","xyz3"];
let theArr = [[], [], []];

objName.forEach((name, index) => {
  window[name] = {
    xyz: xyzArr[index],
    arr: theArr[index]
  };
});

$.getJSON(json, result =>
    {result.forEach((elem, i, array) =>
       {object1.data.push({x:elem.val1, y:elem.val2});
       {object2.data.push({x:elem.val1, y:elem.val2});
       {object3.data.push({x:elem.val1, y:elem.val2});
    })
 });

$.getJSON(json, result =>
    {result.forEach((elem, i, array) =>
       (for let j=0; j<=5; j++) {
           {object[i].data.push({x:elem.val1, y:elem.val2});
       )
    })
 });