I'd be amazed if it is a typo for
Ocean - if you can type, you'd be using different hands for O and c, and if you can't, then presumably you're watching what you're doing.
My guess is that it's a jazz variation on the ln Cohen - it's very fashionable to use surnames as given names, but if there's one surname I wouldn't mess with, it's Cohen! Sounds good, but if you're not Jewish AND a Cohen the likelihood of treading on toes is too great.
I doubt if it's made up. Possibly someone heard Cohen, has never seen it, and used a 'phonetic' spelling?