"In 1910 Jack Nelson, chief of the Howe Sound and Northern survey party, made a bet with Bob Mollison, an axeman, on the height of the waterfall, and put up a bottle of brandy against Mollison's bottle of wine. A chain was lowered and the reading taken. Mollison won. Nelson paid up and gave the name Brandywine Falls." (Wallace Gillespie, quoting Cliff Thorne, Vancouver Sun 17 August 1946).
Another version: c1890 two oldtimers, Charles Chandler and George Mitchell, were on their way to a trappers cabins for the winter, having just gotten over a binge at Squamish. One had a bottle of wine, the other a bottle of brandy. Stopping a the waterfall to make a cup of tea in a billycan, they mixed in the wine and brandy "....and passed out for twenty four hours". (Alex Phillip).
Source: Provincial Archives of BC "Place Names File" compiled 1945-1950 by A.G. Harvey from various sources, with subsequent additions