Sottero Coughkellar Nursey

Hello
I have a birth in 1883 at Miller's Point, NSW, Australia of this Sottero Coughkellar. The mother is listed as Elizabeth Alexander who married on Oct 1875 in NZ and the father Nicholas Nursey born in Greece. I think this child maybe illegitimate born to Elizabeth Alexander and the father being Nicholas but not of the surname Nursey. Does anyone recognise any part of this child's name? Does anyone have the surname Sottero in their family in NSW about 1883 as it may have been the father's surname!
Thanks