There was a William Sherriff and wife on the Georgiana. (Did you only have the name Sherriff with no christian name?)
Google: "Georgiana" arriving Australia, 1839." At the top of a list that comes up, click "of ships arriving in 1839" Scroll down until you see the "Georgiana" on the left of the page..
It gives: William Sherriff, 30, Agricultural Labourer, and wife.
The ship left Leith, Scotland on 14 March 1839 and arrived Port Adelaide 28 Aug 1839.
Hope this helps a little,
Brian