Triskaidekaphobia or Paraskevidekatriaphobia?

A morbid, irrational fear of Friday the 13th.

a) Triskaidekaphobia: From the Greek word treiskaideka, for thirteen. (1911)

b) Paraskevidekatriaphobia: A term coined by media personality and therapist Dr. Donald Dossey. He says that when you can pronounce the word you are cured.