The Rossiter Family

I am looking for information on the following surnames: Rossiter, Estment, Coetzer, Helms and Staples. All of these families have lines in Southern Africa, dating back with the Coetzers and Helms from the late 1650's to early 1700's, Estment and Staples from the early 1800's and Rossiter from 1900. Coetzers originate from Austria, Helms from The Netherlands, Estment from Dorset, England, Staples from Kent, England and Rossiter from Wales / Ireland. All information most welcome.