Merrymans Bay is on the western shore of Berowra Creek upstream from the Woolwash and north-west of Sams Creek. The name is mentioned by Mick Joffe, where the name is said to derive from the lime-burners and shingle cutters who used to sing while they worked.
Sources: Joffe, Mick 1987, Yarns and Photos: Beautiful Old Berowra and Hornsby to the Hawkesbury, Sandstone Press, Berowra, p.82. Powell, John P. 1994, Placenames of the Greater Hawkesbury Region, Hawkesbury River Enterprises, Berowra, p.78.