No idea - but if you ever work it out, tell me! I've one - a male, birth registered under one name, spent childhood to young adult under another, married under another, and then bopped about from one to another to a third, for the births of children!!
And I've a female very similar! Oh dear.
With the male I've used the birth name, which actually was in the end the one he went back to. With the female I also used the birth registration name. with both I put other names in brackets at the time they were used.