According to this site (part german, part polish) Merkel´s grandfather "Ludwig Kazmierczak" was a polish jew originating from Kazimierz (https:// en.wikipedia.org/wiki/Kazimierz) - the author states that that´s the reason why Merkel is am member of the jewish B'nai B'rith Lodge…
I think we need a polishfag to dig into the archives of Posen…