Mary Whitaker Bono Baxley Mack McGillicuddy is a conudrum

So, Mary Bono is the Representative for Palm Springs (my old Representative).  She now goes by Mary Bono Mack.  Bono, because Sonny Bono was famous and she is still riding that train.  "Mack" becuase she is married to Connie Mack - a representative from Florida.
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First,  it is odd that these two representatives from two states thousands of miles away maintain separate homes so they can continue to work in Congress (to her credit Mary Bono is not anti-gay marriage per say - although Connie is).  Of course, you must live in your district - so either they don't live together or they are lying.  But whatever
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Anyway, I find her name is wrong.  She is Mary Bono Mack.  But Connie Mack is not his legal name - and he is reasonably honest about it.  His name is Cornelius Harvey McGillicuddy IV . Now this doesn't sound very down home, so he goes by Connie Mack.  But how can Mary Bono have her name legally changed to Mary Bono Mack?  Can't you only do that with a married name?  (I know California is different, you can change your name by use, but then go to a judge - but "Mary Bonon Mack" is her "official" name in Washington DC - which has different rules).
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At the very least shouldn't she be Mary Bono McGillicuddy?  Just a thought.
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I mean McGillicuddy has a long a beautiful history.  Lucy Ricardo was a McGillicuddy.  And there was a Loch Ness Monster in her McGillicuddy past.