Holder

I just came across your Cape Town Family History website and hope you may be able to steer me to possible sources of information on the family name HOLDER.
My mother was born in S.A. Family name / father’s name being LOCKE, of Scottish origin,
I believe he served in a Scottish Regiment in SA, then decided to stay and marry.)
Her mother’s family name was Holder, just trying to get some direction on where to look?

Thanks for any info.
My best regards

Mike Shawyer
mikeshawyer@yahoo.com