Germans have immigrated to Sweden continuously for a long time and may have come here for any number of reasons. There is no reason to assume any particular reason or time period for their immigration. And Glantz may not even be a German name. It may well be Swedish in origin, even though its appearance is somewhat German. Cf. this page:
http://aforum.genealogi.se/discus/messages/9532/10724.html?977953940 There you will find Glantz used, as it seems, as a Swedish soldier's name (a name given to an individual soldier for easier identification during their time in a certain regiment or company, and sometimes kept as a family name after that). There may be many completely unrelated Glantz families from entirely different parts of Sweden.
In any case, you seem to have insufficient data to draw any conclusions, especially concerning such a distant period as the early or mid 17th century. A name or two is not enough. You will first need to safely identify your Swedish ancestors immediately prior to emigration. Then it will probably not be too difficult to find their origins, whether they are Swedish or German.
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