Pokrzywnicki family genealogical research

[Pock]

My family's original name is Pokrzywnicki. It is a szlachta family from Masovia. My ancestor came to East Prussia in about 1665. The family was given the additional name Bock by the Prussian king in 1775. The genealogy of this Prussian branch of the family is now well researched, but I am still interested in the family's main branch in Poland. Any hint(s) at genealogical information about members of any Pokrzywnicki family would be much appreciated. See also my website at http://www.geocities.com/pokrzywnickiana/

Nikolai von Pock