Although the spelling "Marian" is usually supposed to be the feminine version, there’s really no difference. Both spellings can be for boys or for girls, and the idea that “Marion” with an “o” is for boys and that “Marian” with an “a” is for girls is attributed to folk etymology, or common misconception. Her birth record spells her given name as "Marion".
California Death Index, 1940-1997 about Marion J Patterson. Name: Marion J Patterson; Social Security #: 567366189; Sex: Female; Birth Date: 25 Oct 1903; Birthplace: Idaho; Death Date: 9 Dec 1968; Death Place: Contra Costa; Mother's Maiden Name: McAbee
Social Security Death Index about Marion Patterson. Name: Marion Patterson; SSN: 567-36-6189; Last Residence: 94529 Concord, Contra Costa, California of America; Born: 25 Oct 1903; Died: Dec 1968; State (Year) SSN issued: California (Before 1951).