TSA pre-check application name question
According to the U.S. Department of State Passport Services, you must present 2 or 3 public record documents (school records, tax records, insurance records, baptismal certificate, census record, etc.) that prove exclusive use of the assumed name for at least 5 years.
Also, the applicant must be able to submit "Statement of Witness in Support of Change of Name" executed by two or more persons who have personal knowledge of the applicant's use of both names, and who can attest to the applicant's exclusive use of the assumed name for at least five years. These statements may be executed by relatives or close friends.