There was a George and Eliza TITLEY (nee NORMAN) in Daylesford, Victoria around the 1860s. Only births for Alice (1863), Annie (1864) and George (1866) show. Both had 2nd given name of Norman.
Eliza NORMAN married John WOOD in 1850, in Geelong. They had a daughter Mary in 1854. Possible death for John in 1853. Mary died in 1865 aged 11, mother shown as Eliza Titley NORMAN.
Eliza WOOD married George TITLEY in 1862 (reg 2161).
It is POSSIBLE William was born to her prior to the marriage to George, and took the name TITLEY (at least for a while!).