Adopted son looking for his mother

Mariana WE Balt
Verena Li writes:

My husband and father of my son was given to adoption in Windhoek almost 42 years ago. Now that we have our baby son, we desperately would love to get to know my husband’s birth mother.

All we know is that he was born in Windhoek on 19 May 1975 and that he was named and registered as Robin Brits.

His name was however changed by the adoptive family. Apparently the adoption was processed by a Christian organisation.

We are now living in South Africa and Germany and would wish so deeply to find our ancestors.