Searching for FRIEDERICI 1670-1770 in Göteborg/Stockholm

[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, + ... vor 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.