Complete in ink and do not alter. The name change petition can be filed in the County Court or Supreme Court of the county where you live.A Clark County resident who desires to legally change his or her name must file an application in the Clark County Probate Court. Step 3: Change Your Name Legally. Most adult name changes must be published in a newspaper in Clark County once. This form contains the information that will be published. You go to the courthouse and fill out a form, showing your current name and the name you want, plus your reason for changing it. Once a certificate is submitted to the State, you must complete the affidavit of correction form and submit to the State. Applicant states that a misspelling, inconsistency, or other error of the above-named minor's legal name exists on one or. Follow these steps to file for an adult name change: Copy bw 1.