There are several docs that All say "Murray".....Ralph's marriage record, his birth announcement in the San Diego newspaper, etc.
Here's the CA Marriage Index:
California, County Marriages, 1850-1952
30 July 1945...this is his 2nd m.--his first was at age 18 (c.1943) to Miss Coralie Bergstrom (later Mrs. Louis EBEY).
Los Angeles, California, United States
Marie W Wright
Mary Catherine Mclean
ATTACHED IS BIRTH announcement in San Diego Union newspaper, on 25 Jan 1925, page 5, showing b. to Mr. & Mrs. MURRAY Spencer.
I still think he may have used another name for "legal" docs, like a Census. Also 2 more docs list him in conflicting states--1 says he was b. in Iowa, another says he was from Michigan. He may have stayed in Calif. after he & Marie split-up (sometime between 1925 & 1930,as she is living w/ her mom & Ralph in 1930 census), or he may have gone back to Michigan, Iowa or somewhere else, entirely, but no "Murrays" to be found, that "fit".