Armadillos are from the new world Placental mammals with a leathery Armour shell.
What a coincidence!!!  I saw a dead Armadillo yesterday as i was driving home.  Apparently that hard shell wont protect them from cars.
Armiadillo happens to mean little armoured one in spanish.
I never knew where the name came from, that is interesting.  What do armadillos eat?
In portugese armadillo is known as a tatu which comes form the tupi language,
Hmm.  I have seen armadillos in the southern United States.  Are they found all over the world?  What do they eat?
There are also similair names in other languages and culture especially in European languages.
I mainly see armadillos dead on the side of the road.  Are they nocturnal and move at night?  Are they found all over the world? What do they eat?
Armadillo
Armadillos (from Spanish "little armoured one") are New World placental mammals in the order Cingulata. The Chlamyphoridae and Dasypodidae are the only surviving families in the order, which is part of the superorder Xenarthra, along with the anteaters and sloths. Nine extinct genera and 21 extant species of armadillo have been described, some of which are distinguished by the number of bands on their armour. All species are native to the Americas, where they inhabit a variety of different environments. 
Armadillos are characterized by a
leathery armour shell and long sharp claws for digging. They have short legs, but can move quite quickly. The average length of an armadillo is about , including tail. The giant armadillo grows up to and weighs up to , while the pink fairy armadillo has a length of only . When threatened by a predator, Tolypeutes species frequently roll up into a ball.
Etymology.
The word "armadillo" means "little armoured one" in Spanish. The Aztecs called them "āyōtōchtli" , Nahuatl for "turtle