From Wiktionary, the free dictionary
From Samhain + -o- + -phobia.
samhainophobia (uncountable)
- A fear of Halloween.
2012 October 28, David DiSalvo, “Are You or Someone You Know Samhainophobic?”, in Forbes[1]:Can someone be cured of samhainophobia, or any of the related phobias mentioned above? Yes, indeed.
2020 March 6, Lisa Fritscher, “Could You Have Samhainophobia or the Fear of Halloween?”, in Verywell Mind[2]:While samhainophobia is not a distinct diagnosis in the DSM-5, the fear of Halloween may meet the diagnostic criteria for a specific phobia.
2020 October 30, Kashmira Gander, “What Is Samhainophobia? The Extreme Fear of Halloween That Makes Some People Physically Sick”, in Newsweek[3]:Likely exacerbating the situation for samhainophobia suffered is the fact that the vast majority of Americans celebrate Halloween each year.