Looking for Coertzen of Zambia Origin

My name is Elaine Coertzen (nee)married now a Joseph, may father is James William Coertzen, he married Glady Constance Estelle Heath. My grandfather on my father side was Paul Philipus Coertzen, his wife was Anna Gertruida Coertzen, they lived from memory in Vereeniging...do you know any more are you a relation?