Name change actions can take anywhere from a day to six (6) months (sometimes even longer). The time it takes for such action to be ordered/decreed varies not only from county to county, but sometimes from courthouse to courthouse as well.
Call the Allegheny County Department of Court Records at (412) 350-4201 and tell them you're looking for information on a legal name change. They will describe the entire process to you, including estimated costs, and mail you the necessary forms. As of September 2017, these are the name change petition forms.
Allegheny County Pittsburgh / County
Government - Allegheny County, PA.
To change from your maiden name to your married name on your Pennsylvania driver's license, you will need to complete the DL-80 form and file it along with your certified marriage certificate, and proof of Pennsylvania residence (such as a utility bill) if your address has changed.
How do I change my name on the deed? The Allegheny County Real Estate Office handles owner name changes, please call 412-350-4226. Please note, if any changes are made to the deed you must reapply for any programs (i.e., Homestead, Senior Citizen Tax Relief).