do you mean hmmmmm you'll consider it as a mn, or hmmmmmm to put it on the list for a first name?
What do you think of the general idea to extract the nn Rocco out of two (whichever, ross and cormac just suggestions that work) more 'sensible' names, and letting the nn Rocco evolve in a faux organic way??? (i'm such a fraud!)
A Cormac sounds like he'd be good at sport. Colin sounds like a cup of weak tea.
Also Cormac has a slightly surnamey feel. In fact, I used to work with somebody whose surname was Cormac.