How common is it for somebody to get cubital tunnel syndrome?

Too often: I believe you mean carpal tunnel syndrome. This is a condition of narrowing and irritation of the median nerve at the wrist (the carpal area) in which the area supplied in the hand gets numb, tingly and rarely has loss of muscle function. There is occasional pain at the tunnel. Treatment is with ice and nsaids. Some may need injected steroids. A few require unroofing of the tunnel by surgery.

Not uncommon: Cubital tunnel syndrome is the second most common compressive neuropathy of the upper extremity. While it is not rare, it is not as common as carpal tunnel syndrome. Both present differently with cubital tunnel syndrome more commonly causing numbness and tingling in the small finger and 1/2 of the ring finger. In more advanced cases, there can be loss of coordination and muscle in the hand.