have you ever checked simple the german phonebook?
there are 5 hits for Hatfield - a good possibility to write this persons:http://www.dastelefonbuch.de/
Hatfield James in 69181 Leimen (close to Heidelberg and not far away from Wiesbaden and Frankfurt am Main)
Hatfield Judith in 72280 Dornstetten
Hatfield Kay in 68167 Mannheim-Neckarstadt
Hatfield Renate in 97494 Bundorf-Stöckach (nearest to Czech border, north-west of Pilsen/Plzen)
Hatfield Sarah in 52064 Aachen
take the maps for their homes at phonebook and zoom out to see where they are located.