http://files.usgwarchives.org/ga/taylor/military/civilwar/other/confedvets.txt
cosey Name Meaning and History
1. English: variant of Cossey. Coursey
2. Perhaps also an Americanized spelling of French Cossé (see Cosse).
http://boards.ancestry.myfamily.com/surnames.cosey/2/mb.ashx?pnt=1