Hi Laura,
I have a great, great grandmother named Josephine Goca (Goakey). She is the daughter of Jeston A. and Mary Eliza (?) Goakey. She was born c. 1841 and died 8 Sep 1892. She married Calvin Johnson on 17 Sep 1859 and later to James A. Fisher. There is a Gauthier genealogy forum at
http://www.genforum.genealogy.com. I know of one post on this forum that gives a history of the name. The names Goca and Goakey are derivations of Gauthier according to this person. Let me know if I can be of further help.
Regards,
Don