Triskaidekaphobia means fear of the number 13.
Paraskevidekatriaphobia means fear of Friday the 13th (which occurs one to three times a year). In Italy, 17 is considered an unlucky number. In Japan, 4 is considered an unlucky number.

okayyyyyyy.....there is a fear for everything and anything in the world...how about the fear of super-long-unpronounceable-words??