Benson, Adolph B. and Naboth Hedin, eds. Swedes in America, 1638-1938 (The Swedish American Tercentenary Association. New Haven, CT: Yale University Press. 1938) ISBN 978-0838303269
Great! I'm finding some transcribed passenger lists which state country of origin. Interestingly, the earliest ships had many Walloons who had first resettled to Holland before making the 'big trip'. The fact is it's this cultural diversity that may cause a headache from a genealogical perspective: names were transcribed in all sorts of ways - often purely phonetical - which is why there are so many duplicates on Geni.