Cain and Caine are well-known manx names, from the Irish MacCathain (grandson of "Warrior"). One Manx Caine has DNA tested & found to be Norse, a Viking descendant. Testing is painless, just a cheek swab, no lab visit, all done from home.
Cain & Caine males are invited to join the Cain surname DNA project at www.familytreedna.com/public/Cain-Caine