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Yes, a second element "powerful" seems more plausible than the "journey" that I had so far in my own database.

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The Gothic word is swinþs "strong". The English word sound in the sense of "healthy" and the German word geschwind for "fast" have the same root:
http://www.nordicnames.de/wiki/SWIND
http://www.etymonline.com/index.php?term=sound