Words are pronounced differently in different regions of a country. I heard that when Sophia Loren first started making films in Italy, her voice was dubbed because other Italians couldn't understand her dialect of Italian.
Besides, there is no such thing as an "original language" for a word, unless you are talking about a language spoken by prehistoric human beings. Words evolve from other words, and languages evolve from other languages.
According to etymologyonline.com:
Pasta - from It. pasta, from L.L. pasta "dough, pastry cake, paste," from Gk. pasta "barley porridge," probably originally "a salted mess of food," from neut. pl. of pastos (adj.) "sprinkled, salted," from passein "to sprinkle."
According to Wikipedia, Milan was originally called Medhlan by the Celts.