Oko sto pedeset matematičkih pojmova nosi njegovo ime: Feller process, Feller transition function, Feller semigroup, Feller ' s property, Feller Brownian motions, Feller ' s test for explosions, Lindberg-Feller condition, Feller operator, Feller potential, Feller measures, indefinite Krein-Feller differential operators, Kolmogorov-Feller equation, itd.