In Plato's The Symposium: humans were originally created with 4 arms, 4 legs, & a head with 2 faces. Fearing their power, Zeus split them into two condemning them to spend their lives in search of their soulmates.my favorite.
What about Fear of water? Phobias: xenophobia definition is a bit simplistic; yes 'strangers' but also more towards the fear of foreigners. Usually, used socially and culturally than just 'strangers' but I digress.