Capitalized Common Nouns Derived From Proper Nouns
Proper nouns may be used as common nouns, as members of a unique class of common nouns. For example, the corporation Toyota builds vehicles which are colloquially called Toyotas; the fact that the latter is a common noun can be seen in how it can be modified: a Toyota, my Toyota, many Toyotas. Such uses typically arise through ellipsis or metonymy: a car made by Toyota → a Toyota car → a Toyota. Similarly with nationalities and members of religions: America and Christ are proper nouns, American and Christian are not, but retain the capitalization of the proper nouns they are based on. In many languages, such derivations lose the capitalization.
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