octophobia

From octo- +‎ -phobia.

octophobia (uncountable)

1. The irrational fear of the number eight.
   • 2022 March 22, “Octophobia (Fear of the Number 8)”, in Cleaveland Clinic‎^[1]:

     People with octophobia experience anxiety when they think about or see the number 8.

• tocophobia