Just bringing this up because we've moved into the realm of the theoretical and historical, but why is it a cultural norm to change names at all? Where did this originate, and why is it the norm in some cultures but not others? Why do people have the urge to change their name, or think that's a good idea? Why do some young women grow up writing their crush's name with their own like, "Mrs. Beth McIntyre" (for those not into NKOTB:http://en.wikipedia.org/wiki/Joey_McIntyre)? Why do some of us feel strongly (as my husband did) that we share the same name after marriage?
I don't have answers to these questions, but just food for thought. I think my husband and I were both partially influenced by having strong family ties and family-related identities. I am very much part of my family, love spending time with them, identify strongly as one of them, am recognized regularly for being related to them, etc. and so giving up my name would have been giving up a very strong component of my personal identity. And the same went for my husband. He was raised by his mother and grandmother, who share a last name (so he is carrying on his mother's name and not his father's), and his aunts and uncles were also a big influence on him, so while he was willing to give up his name in favor of mine, he also preferred to keep his. By combining names, we both kept those identities and I think both families were happy that we kept our own names and added each others'. It's non-traditional, as well, and we don't mind standing out, so while others may prefer the simplicity of one name, we embrace it and will talk about it with anyone who asks--a cashier at a drive-through recently asked me about it after seeing my credit card, and I answered all of her questions. :)