This street was born in 1902 as Morgan Street, presumably in honor of the famous banker J.P. Morgan. (Several streets here are named after Gilded Age industrialists, e.g., Carnegie Street.) It was changed to Cudahy Street in 1913, one year after the City of Los Angeles annexed this neighborhood, as L.A. already had a Morgan Avenue. I assume that, in keeping with the industrialist theme, someone suggested meatpacking mogul Michael Cudahy (1841-1910) as a new namesake. Cudahy himself was based in Chicago but owned a winter home in Pasadena and vast holdings south of L.A., some of which became today’s city of Cudahy. See Walnut Park’s Cudahy Street for more on the meat man.