There is a birth reg. for a William McKellar Dickens in Victoria, 1863 (??)
He was a brother of Charles Frederick Dickens.
Given Names: William Mckellar
Spouse Surname/Father: Charles John
Spouse Gvn Names/Mother: Mary CLARK
Birth Place: PRES
Reg Number: 3076
Note birthplace on the reg. is 'Pres'.
If you Google 'William McKellar Dickens' you will find a link to 'Fees Family History Blog: Letters to Australia' which includes some family history on a Charles Frederick and a William McKellar Dickens.
Apparently their father Charles John Dickens came out to Australia in abt. 1847, and was manager of a property named 'Preston', near Mansfield, Victoria.
His marriage reg.
Given Names: John
Spouse Surname/Father: CLARK
Spouse Gvn Names/Mother: Mary
Reg Number: 25663
Denomination: Church of England