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Re: Name or place?
Söderbäck is listed as a populated place at both the NGA website (tinyurl.com/ofh84bv) and the Geonames website (tinyurl.com/zm2znyn). However, there's also a populated place named Söderbacken in Finland (tinyurl.com/hqgqfzl) so that placename could also very well be the origin of the surname.
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Well, there's nothing actually there in Sweden. The nearest populated place to those co-ordinates is a small village called Flarken. Söderbacken in Finland seems to be a farm at the end of a dirt road. There do seem to be at least a couple of streams known locally, if not officially as Söderbäck in Sweden, including one near or through Söderbäck farm. However, for the context of the question, they are family names, not places.
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