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In the vast majority of states, when it comes to baby names, anything goes. This includes first, middle, and last names. You don't have to give the baby the last name of either parent -- for example, Mary Jones and Jack Brown can name their child Sunrise Smith. You may opt to hyphenate both of your last names, give the child one of your last names as a middle name -- or decide later and amend the birth certificate to reflect your new choice. (You can amend a birth certificate by contacting your state's Department of Vital Statistics, which you can locate through the website of the National Center for Health Statistics.)