From Frigga (an English variant of Old Norse Frigg, the Norse goddess for whom Friday was named) + triskaideka- + -phobia.
- The fear of Friday the thirteenth.
2012, R. W. A. Mitchell, Ask a Little-Learn a Lot: How Questions Change Everything, iUniverse, published 2012, →ISBN, page 90:
The fear of Friday the thirteenth, or friggatriskaidekaphobia, takes the thirteen superstition to a whole new level.
2013, Sara Latta, Scared Stiff: Everything You Need to Know About 50 Famous Phobias, Zest Books, published 2013, →ISBN, page 186:
Friggatriskaidekaphobia is probably the most common superstition in the United States; according to researchers, it affects 17 to 21 million people.
2013, Rachel Wise, Breaking News, Simon Spotlight, published 2013, →ISBN, page 2:
So I started Googling, and I found some interesting information about “friggatriskaidekaphobia.” (That's the actual term for the condition of the fear of Friday the thirteenth. […]