I use my first name. When our first child was born it was "fashionable" in this area to name girls things such as Mary Faye, Marie Suzanne, etc. And then the child would go by the middle name because there were too many Marys and Maries around. Our daughter is one of those Maries. So she goes by her middle name, except the schools always used the first name. Very confusing. Our second daughter goes by her first name.