SpriteGrid.cs

List<GameObject> sprites;
List<GameObject> nameTextFields;
for (int i = 0, n = sprites.Length; i < n; ++i)
{
  var s = sprites[i];
  var ntf  = nameTextFields[i];

  int row = i / numCols;
  int col = i % numCols;

  s.transform.position = 
    new Vector3(col * colSize, row * rowSize, 0.0f);

  ntf.transform.position = 
    s.transform.position
    + textFieldOffset;
}