Formal Name For Fear Of Friday the Thirteenth

Friday the thirteenth is considered the unluckiest of days in many superstitions, unless you were born on Friday the thirteenth in which case it is your lucky day.
The fear of Friday the 13th is called paraskavedekatriaphobia or paraskevidekatriaphobia, a specialized form of triskaidekaphobia, a phobia (fear) of the number thirteen.
Origins
The origins of Friday superstitions are many. One of the best known is that Eve tempted Adam with the apple on a Friday. Tradition also has it that the Flood in the Bible, the confusion at the Tower of Babel.
The origins of the Friday the 13th superstition have also been linked to the fact there were 13 people at the last supper of Jesus, who was traditionally crucified on Good Friday, but it probably originated only in medieval times.
It has also been linked to the fact that a lunisolar calendar must have 13 months in some years, while the solar Gregorian calendar and lunar Islamic calendar always have 12 months in a year.