The origin of the unique toponym Ballona is much disputed and possibly unknowable.[1] Various theories have been exchanged for more than 150 years.
1875: Misspelling of Ballena, Spanish word for whale (various dead whales did wash up near Ballona during the 19th century), or misspelling of Spanish “valle” meaning valley [2]
1893: An introduction to Southern California in the Los Angeles Herald noted “Ballona, meaning and derivation unknown; not Spanish.”[3]
1939: “The origin of the word Ballona is in doubt.” Discounts whale theory; Cristobal Machado, an heir of the rancho family, suggests it’s somehow derivative of “bay” [4]
References
^"F.A.Q."Ballona Creek Renaissance. Retrieved 2022-07-30.