In 1917, however, as the Postmaster General declared that Terrors Creek sounded too much like Torrens Creek, once again, the township acquired a new name. Although the first known inhabitant, John McKenzie, operated a pit sawmill just south of the townsite from 1866, the third and final name selected for Dayboro honours another notable early settler, William Henry Day.
In 1917, the Postmaster General changed the name of Terrors Creek to avoid confusion with Torrens Creek. The township was renamed again in 1866 when John McKenzie established a sawmill near the townsite.  The third and final name for Dayboro honors William Henry Day, an early settler.