Pasadena subdivider Charles Moses Skillen (1838-1925) laid out and named this street in 1885. (Tiny Skillen Way lurks nearby; it’s essentially a parking lot.) An 1895 book on Pasadena history stated that Skillen, a New York native who lived in Ohio before settling in Pasadena in 1880, named the street after Cleveland, Ohio’s own Euclid Avenue, which at the time was renowned across the U.S. as “Millionaires’ Row”. There are several Euclid-named streets in Los Angeles County; some may likewise copy Cleveland’s famous thoroughfare and some may directly honor Euclid, the ancient Greek mathematician. See Euclid Avenue in Boyle Heights for a theory.