I entered the US with a K1 fiance visa, and just recently got married. We are in the process of applying for registering permanent residence and adjustment of status. I need to know which name to write on the forms: I-485, I-765 and other documents, maiden or married name?

Also, in the Philippines our common practice is for a woman to make her father's surname her middle name after getting married. E.g. (Given name - Middle/Mother's maiden name - Father's surname) Gloria Macaraeg Macapagal will become (Given name - Father's surname - Husband's surname) Gloria Macapagal Arroyo. Can I do the same here in the US should the forms require my married name? I wasn't sure because I heard from someone that here in the US you have to go through a legal process before you can change your middle name. I prefer to use my Father's surname as my middle name.

Thanks in advance.

Van
SD