Main Street in San Francisco was named after Charles Main. https://mountainviewpeople.blogspot.com/2007/09/charles-main... Here are some more interesting ones... * Mason jar was named after John Landis Mason, 19th century American tinsmith * Guppy (fish) was named after Robert John Lechmere Guppy, 19th century British naturalist * Silhouette was named after Étienne de Silhouette, 18th century French politican * Bloom…
I feel this might be a bit of a cheeky urban legend, or at the very least a coincidence.
"Main st" has been used in western city's and towns for a lot longer than SF has been around.