A holographic will may be probated only upon the testimony of at least three competent witnesses that they believe that the will is written entirely in the handwriting of the person whose will it purports to be, and that the name of the testator as written in or on, or subscribed to, the will is in the handwriting of the person whose will it purports to be.
N.C. Gen. Stat. § 28A-2A-9