The Phyllis in question is almost assuredly Phyllis Horowitz (1911-2000). Her father Al Horowitz (1883-1976), a Russian Jew who came to California when he was 8, ran a department store nearby, back when West Hollywood was still called Sherman. He also owned a chunk of land at Hammond and Phyllis, which he subdivided in 1922-1923, so it’s a safe bet that he named this street after his daughter. Betty Way, a couple of blocks east, might for Horowitz’s other daughter Alberta, although she spelled her nickname “Bettie”. Meanwhile, Hilldale could be a pun on Al’s wife Hilda – the Horowitzes were here when that street was named, but it’s uncertain if Al owned the land yet. Anyway, Phyllis graduated from Fairfax High and married Victor J. Dollinger in 1931. They ultimately settled in Reno, where Victor owned a shoe store, in 1953. The couple had two sons, Steve and Terry.