Wally's Market
Duke University
Sally, Blair's Boutique
Mexican
Usually proper nouns are capitalized and a name of a person, place or thing. They contrast with common nouns, which are the words for something like boy, dog, city, day etc.
NOUN -- a word (other than a pronoun) used to identify any of a class of people, places, or things ( common noun ), or to name a particular one of these ( proper noun ).