You file a motion with the court of jurisdiction. They may or may not agree her fathers name needs to be changed.
You file a motion with the court of jurisdiction. They may or may not agree her fathers name needs to be changed.
Info here: http://www.mdcourts.gov/family/forms/drin62.pdf
You'll have to serve him and publish notice. Obviously he gets to contest the change. The judge will decide what is in the best interest of the child (if the child is a year old or older).