Gilbert was very likely born in Bandon, Co. Cork, Ireland. The DUKEs came from there with the group of Irish Protestant settlers @ 1817. There is a good website at http://home.alphalink.com.au/~datatree/wolf%2009.htm
Also there is a Message Board about the group which may be really helpful if you search the archiveshttp://lists.rootsweb.com/index/other/Ethnic-Irish/CAN-CHALE...
Hope this helps,