Cosman is most likely from a German origin (would have been KOSSMAN, KOSMAN, or maybe KOZMAN if from Eastern Europe).
Looking at Canada's phone book using - http://www.canada411.comhttp://www.canada411.com - there are 267 COSMAN, 27 KOSMAN, and 23 KOSSMAN names listed.
Of the 267 COSMAN names, Ontario has 79 listed (29.6%), followed by New Brunswick with 72 (27.0%) and Nova Scotia's 58 (21.7%). Another 29 (10.9%) are in British Columbia, with 20 in Alberta (7.5%). THis makes up 96% of the total COSMAN spellings in Canada. This is obviously the most common spelling of this name in Canada. ________________________________