proper noun n. substantiv propriu;

E.g.: A political, economic or rligious label formed from a proper name—eg, Gaullism, Paisleyite, Leninist, Napoleonic, Wilsonian, Jacobite, Luddite, Marxist, Hobbesian, Thatcherism, Christian, Buddhism, Hindu, Maronite, Finlandisation - should have a capital. (economist.com)