why do viruses attack people and depend on other cells? who created all these names?

https://www.google.com/search?source=hp&ei=ZCCaXfb9OIO2swXr6r2ABA&q=why+do+viruses+attack+people&oq=why+do+viruses+attack+people&gs_l=psy-ab.3..0i22i30.4440.4440..11779...0.0..0.117.117.0j1......0....2j1..gws-wiz.nNqu5S8FiGU&ved=0ahUKEwj2v7DGkIjlAhUD26wKHWt1D0AQ4dUDCAg&uact=5

Scientific names were usually created by the scientists who worked with them.