Searching for Japp family

Hi there, I reside in Durban, Kwazulu Natal, South Africa. I would love to find more family members, not only in this region but also elsewhere. My father's name was Harry and I know that I have family (a niece and nephews in USA), called Johan, Justin and Annemie. If anyone knows about how the surname Japp got from Scotland to RSA, or can tell me where to find the information that will be much appreciated. Go well and God bless.