@ Nelda: Your posting #11 could be misread to mean that the middle name is typically the maiden name (i.e., the original family name of the wife). Although this is possible and is not rare, it is by no means the norm. For example, building on your own example of John Fitzgerald Kennedy, he was the only child in that very large family to receive his mother's maiden name as his middle name. The first and middle names of the other children included Joseph Patrick, Robert Francis, Kathleen Agnes, Jean Ann, and Edward Moore.
It needs to be stressed that the traditional American naming convention includes a first name, a middle name, and a last name. With few exceptions, the last name is the family name coming from the male line. There was (and is) no strict rule for what names could be used for first and middle names.
To understand American naming conventions for married women, it is helpful to look at the earlier, pre-feminist period, e.g. before the mid-1960s. Before the 1960s it was the norm for the woman to adopt the family name of her husband. She would drop her own family name, while retaining her original first and middle name. Thus if Susan Mary Smith married John James Jones, she would become Susan Mary Jones.
Since the 1960s, American women have tried various means of retaining their original family name. These have included:
--a hyphenated last name: Susan Mary Smith-Jones or Susan Mary Jones-Smith.
--Retaining the maiden name and not adopting the husband's family name: Susan Mary Smith.
--Replacing the original middle name with the maiden name and adopting the husband's family name: Susan Smith Jones.
None of these have become standard practice, so you can not make any assumption about what name a woman may adopt after her marriage. You have to ask her. And a significant number of women still follow the traditional practice. I don't have any data to back it up, but my own sense is that there has been a swing back to the traditional practice over the last 10 years.
My own wife retained her maiden name for professional purposes. For other purposes, she replaced her original middle name with her maiden name and adopted my family name as a new family name. She has a variety of IDs and credit cards with both forms of her name. Since the birth of our daughter, she has actually reverted in some situations to the traditional custom of using her original first and middle name with my family name. This is because my wife and my daughter have that same middle name, and my daughter likes sharing that name with my wife.