Chickens have nothing, really absolutely nothing to do with chicken pox. The scientist’s needed a name for the highly contagious but less fatal than it’s deadly and dreaded small pox form, the other form of chicken pox. Because small pox was already named they needed another name for this different less deathly form. To make it clearly different from the other form they named it unscientifically Chicken Pox.
Did you know? Even animals have the pox diseases, specially the chicken pox, the animals that resemble us, chimpanzees and other primates.