Linked from
The 5 pages that link to Proper noun, each with the reason it gives.
OnomasticsNarrower topic: Onomastics examines the names that function as proper nouns.
NounBroader topic: Proper nouns identify individual referents rather than naming a general class.
LexiconRelated: Word games and lexical resources differ on whether names count as valid entries.
EponymNarrower topic: Eponyms often begin as proper names before becoming names for other things.