FRIEDERICI in Göteborg + Stockholm between 1670 and 1770

[Georg Roberto Friederici]

I request some help, I'm searching and trying to know the place or city of origin from the family Friederici in Göteborg and Stockholm.  
Did she came from Danzig, Pommern, Mecklenburg, Ostpreussen In Göteborg it's known  
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Christian (or Johann ?) Friederici (* aprox. 1670, + ... before 1744), merchant in Göteborg  
The son was:  
Christian Friederici (* 1712 in Göteborg, + 1762 in Göteborg), also merchant in Göteborg, married twice,  
have had more than 7 childrens. I'm looking for descendants.  
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In Stockholm it's known  
Joachim Christopher Friederici oo 1762 Brita Holmstrom. I'm looking for descendants.  
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In Elbing it's known  
Christian Friederici (* ca. 1690, + ... ), 1719-27 Kantor in Elbing. I'm looking for descendants.  
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In Rostock it's known  
Christoph Friederici, * 1633 in Rostock, + ... Profession  
mayby (?) his son:  
Christian (?) Friederici, * aprox. 1660 in Rostock, + ... Secretary of the city Rostock.  
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Appreciate help. Please review your genealogical Literature. Thanks.  
See: www.friederici.de