Posener is probably a German Yiddish name as it pops up in German sites on internet.
A few Posener documents in SA Archives:mostly Cape & apparently Jewish:
DEPOT TAB
SOURCE MHG
TYPE LEER
VOLUME_NO 0
SYSTEM 01
REFERENCE 4889/58
PART 1
DESCRIPTION POSENER, ZALIG.
STARTING 00000000
ENDING 00000000
REMARKS DOUBLE REGISTRATION SEE FILE NO 5326/58.
DEPOT KAB
SOURCE MOIB
TYPE LEER
VOLUME_NO 2/2738
SYSTEM 01
REFERENCE 354
PART 1
DESCRIPTION POSENER, SAMUEL. INSOLVENT LIQUIDATION AND DISTRIBUTION ACCOUNT.
STARTING 19040000
ENDING 19050000
DEPOT KAB
SOURCE MOOC
TYPE LEER
VOLUME_NO 6/9/9363
SYSTEM 01
REFERENCE 80980
PART 1
DESCRIPTION POSENER, ISAAC LEO. ESTATE PAPERS.
STARTING 19420000
ENDING 19420000
DEPOT KAB
SOURCE CSC
TYPE LEER
VOLUME_NO 2/1/1/1492
SYSTEM 01
REFERENCE 357
PART 1
DESCRIPTION ILLIQUID CASE. RESTITUTION OF CONJUGAL RIGHTS. ABRAHAM POSENER
VERSUS DOREEN FRANCES POSENER, (BORN BREMRIDGE).
STARTING 19450000
ENDING 19450000
DEPOT SAB
SOURCE UOD
TYPE LEER
VOLUME_NO 1940
SYSTEM 01
REFERENCE E176/28
PART 1
DESCRIPTION CRIMINOLOGICAL INSTITUTE - DR PAUL POSENER
STARTING 1946
ENDING 1946
