geminiphobia 

the fear of twins (esp. identical)

"OMG two people born from the same mother at the same time! That is so gross!" - person with geminiphobia

geminiphobia by Dr. Heywood R. Floyd June 27, 2012

geminiphobia 

The fear of a human being who was born when the sun was moving through the earth and gemini constellation.

I can't be around him! My geminiphobia will make me freak out!

geminiphobia by OGBread August 3, 2017