HOW TO CHANGE YOUR NAME AFTER MARRIAGE

Upon entering into marriage, either party may retain his or her surname prior to the marriage or change his or her surname to the surname of the other party or change the surname to a hyphenated combination of the full surnames of both parties. If a party requests a surname change under RSA 5-C:41 II-a, that party may also change his or her middle name to his or her surname prior to the marriage. Each party shall indicate on the marriage application worksheet the party's name after marriage.

You are required to perform your name change with the DMV within 30 days of your marriage.  Failure to do so, will result in a legal name change through the court system which is more money.  Don't delay this step.