http://www.colonialswedes.org/forefathers/Keen.html

The Descendants of Jöran Kyn, the Founder of Upland

The history of Jürgen Schneeweiss prior to 1642 is unknown other than the fact that he came from Saxony. Undoubtedly, he was among the many Germans recruited into the Swedish army during the Thirty Years War. His name translates into English as "George Snow-white," the second name being indicative of his personal appearance, possibly the color of his hair or the lightness of his complexion, or both. After becoming a freeman, he substituted the word Kühn, meaning "bold" in German, which became the family surname. Variously spelled as Kijn, Kyn, Kien, Kühn or Keen, the surname eventually became standardized as Keen. He sailed to America on the Swan, arriving in the New Sweden colony with Governor Printz on 15 Feb. 1643. He served as a soldier under Printz until 1653 when Printz returned to Sweden.