Okla. Stat. tit. 58, § 1205
A person may make a transfer by irrevocable gift to, or the irrevocable exercise of a power of appointment in favor of, a custodian for the benefit of a minor pursuant to the provisions of Section 10 of this act.
Laws 1986, HB 1227, c. 261, § 5, eff. November 1, 1986.