The Rudderforth named spelled this way seems to be quite uncommon. At the moment there are only about ten entries for this surname in US directories, and fewer than that in Australia that I have found. So anyone with this name in their tree is probably a cousin on some level and I would very much like to make contact with you and exchange data.
The Rudderforth in my line is Thomas Henry, born on board ship in Sydney Harbor, Australia in 1848. Both of his parents were born in England (names and places unknown). I first find reference to a Thomas Rudderforth in D.C. in an 1861 City Directory. (A Thomas Rudderfoth is also buried in Congressional Cemetary with an interment date of 2 Apr 1882) Thomas Henry married Emma Smitson Laurie on 3 May 1873 in D.C. By 1877, he is listed as a policeman and he is accounted for in the 1880 D.C. census. He and Emma had 5 children in D.C.: Mary Grace (my grandmother) b. 16 Nov 1873 d. 3 Sept 1933; Emma Francis b. 1875; Daisy B. b. 1877; Thomas Henry Jr. b. 1879; and Frank W. b. 25 May 1882 d. July 1949. Thomas Henry Rudderforth, Sr. died in D.C. in May 1893; Emma Rudderforth died in D.C. on 15 Feb 1902; both are buried in Congressional Cemetery.
Mary Grace Rudderforth married William Henry Mullen in 1893 and had at least 8 children: Joseph Alfred, Grace, Mason Thomas, Jack Rudderforth, William Benoit, Ernest, Frank Bertram (my father, b. 2 Apr 1907 d. 26 July 1986), and Alice Bredina. They probably had another daughter, Laura, who, like Grace, died in infancy.
My research in Australia has turned nothing up yet. I did find reference to a Thomas Rudderforth in London in the 1785 and 90 Merchant and Tradesman's General Directory, listed as associated with a stay warehouse. Since this name, Thomas, obviously runs through the family, there's a possibility that this could be a relative.
That pretty much accounts for my whole knowledge of that branch of my family at this time. Any info on Rudderforth antecedents or progeny are deeply appreciated.