I didn't realize that so many people changed their name in one sense but not the other. When I got married one of the first things we did after getting back into town was to both go and have our social security, passports and IDs changed. I have securities licenses and my employer was very insistent that any name change had to be complete and immediate to avoid me conducting business for even a moment under a name that wasn't legally mine. There were cards and placards and the like in the new name waiting for me when I got back from the wedding trip. They even re-etched the glass in my office while I was away.
On a side note I wonder if I'm the only man in the thread who changed his name when he got married...