To obtain a legal name change in South Dakota, an applicant must submit a petition to the court. The applicant must publish notice of the hearing and petition details in a legal newspaper once a week for four weeks. (S.D. Codified Laws §§ 21-37-1 to 21-37-10)
For instructions on legal name changes for minors under 18 in South Dakota, see NCTE's Name Changes for Minors in South Dakota resource.