merge two names to be one

Answer 1

There isn't an automated way to merge two people on the family tree into one person. I would do something like this:

1. One of the two people is connected to the tree initially as a child of someone on the tree (Person A) and the other person is connected to the tree initially as the spouse of someone on the tree (Person B).
2. Person A (the descendent, not the spouse) is the person you want to "keep". 
3. Add all of the descendents from Person B who are not already attached to Person A to Person A.
4. Once everyone is added to Person A, Delete those people from Person B (from lowest to highest on the tree)
5. Finally delete person B and add them again in the same spot, but when you add them as a spouse, choose "Partner with person already on tree" Then pick Person A as that person. 
6. This will cause them to appear as a "duplicate". This is what you want. A duplicate simply means that this person also appears elsewhere in the tree, because they are related in more than one way.