John Singleton's daughter Dawn named as Westfield Bondi Junction stabbing victim

Multi-millionaire advertising guru John Singleton's daughter Dawn is among the six people murdered by a knife-wielding attacker at Westfield shopping centre in Bondi Junction on Saturday.

Affectionately known as Dawnie, the 25-year-old who is one of Singleton's three daughters from his marriage to Julie Martin, died in the rampage by Queensland man, Joel Cauchi, on Saturday afternoon.

John Singleton's daughter Dawnie, 25, has been named among six people murdered by kniofe wielding attacker Joel Cauchi at Bondi Junction Westfield on Saturday

Joel Cauchi from Queensland is pictured carrying a 30cm hunting knife on the escalator inside Westfield shopping centre at Bondi Junction on Saturday afternoon

Five women and one man were killed and others wounded before a female police officer Amy Scott shot 40-year-old Cauchi dead. 

One of the other victims identified is Sydney woman Ash Good, who handed her nine-month-old-daughter to a stranger to save while she was being attacked. 

Police have said two of the six people who died in the attack were from overseas and had no family in Australia. 

Police have confirmed the man was a security guard but could provide no further details. 

Dawn is the oldest of three daughters to  John Singleton and his former wife Julie Martin (the couple pictured above)

NSW Police Commissioner Karen Webb said it might take some time before all victims could be formally identified due to their loved ones being overseas.

Part of the investigation would involve looking at the possibility Cauchi was specifically targeting women in his attack, she told reporters on Sunday.

The 40-year-old, who had recently moved to Sydney from Queensland, had a history of mental health issues and had previously come to the attention of police in both NSW and his home state.

Premier Chris Minns said all of NSW would need to get behind the families of those affected by the tragedy as they went through "the inevitable grief associated with such a horrifying, horrifying event".