Most likely named for Harry M. Londelius Jr. (1918-1999). Londelius grew up comfortably in Chicago: his German grandfather Christian had founded that city’s C.A. Londelius & Sons hardware store, which his father Harry Sr. continued to run until around 1942. Various Londelius family members trickled into Los Angeles between 1927 and 1950; Harry Jr. was here by 1940. After serving in the Navy during WWII, he became an architect, designing numerous apartment buildings and even – if reports are correct – the Dilling Street house that posed as the Brady home in The Brady Bunch. (A 2019 L.A. Times article erroneously credited his father with the work.) Londelius obviously knew a lot of Valley developers, so I see no reason why he wouldn’t be Londelius Street’s namesake; Frank and Helen Brick owned the 1954 tract on which it was named, so it’s possible that Londelius had worked for them at some point.
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