If you marry you add the new surname to you full name at birth and the  new total is the experience your marriage will give you, it won't change the Destiny Number your birth lesson but will give you an extra experience good or bad. Jacquies marriages gave heir a Master 10/1 vibration very powerfull.

J A C Q U E L I N E      L E E     B O U V I E R  
1 1 3 8 3 5 3 9 5 5      3 5 5     2 6 3 4 9 5 9
     43/7                    13/4         38/11/2
       7            +           4          +     2  = 13  / 4  Destiny
Jacqueline Lee Bouvier  has a 4 Destiny  
Adding the 6 from K E N N E D Y will make it a 10/1 Experience.
                           2 5 5 5 5 4 7
                                33/6

Jacqueline Lee Bouvier / O N A S S I S  
                                   6  5 1 1 1 9 1
                                          24/6
Adding the 6 from Onassis to the 4 Destiny will make it a 10/1 Experience.

I agree that there is a lot of angle on it.
Anybody who want to know this... could learn via Lunar Calendar of: Moslem, Chinese, Hindhuism, Buddhism as well as tribal calendar of some tribes around the world. My view; most of them had calculated there are times when the hardest and most difficult vibration coming down to earth which will result to many bad situations around the world which all of the Religions, Spirituality and Believes will suggest not to do any happiness related ceremonies.

At those days or months; it is advised to do more contemplative activities to avoid any un-pleasantness to your life.

I do believed in it and practiced it for a long time