My mother-in-law is a Cutbush.
I have been doing extensive research for her here in England using a web-site called Ancestry.co.uk
It is a brilliant web-site and one can get most information from it, provided that they have it.
My mother-in-law's Cutbush family mostly come from Lambeth London and I have managed to go back to the early 1800's. Without birth certificates it is difficult to be sure one has the right connections because the father's names are repeated through each generation and they did have big families.
There is a distant family link to Thomas Hayne Cutbush, the "Ripper suspect". It was his father (Thomas Taylor Cutbush) that emigrated to Australia in about 1867 a year after T.H.C was born (did he run away?). There is also a link to Charles Cutbush the Superintendant of Police who died (committed suicide ?) in 1896. Was this due to being embarrassed by Thomas ?
Regards to Paul Cutbush in Canada who gave me this link and is my cousin by marriage.