The point is that Pauli called his protegé neutron which was all right since the particle called "neutron" today (the chargeless proton) had not yet been discovered. However, that name was not "copyrighted" since it was only used in private conversations and correspondence and never in print.  When, in 1932, James Chadwick proved the existence of a chargeless particle with a mass closely equal to that of a proton, he called it neutron in his paper in the Proceedings of the Royal Society of London. When Fermi, still being a professor in Rome, reported Chadwick's discovery at the weekly physics seminar, somebody from the audience asked whether "Chadwick's neutron" was the same as "Pauli's neutron". "No" answered Fermi (naturally speaking in Italian), "i neutroni di Chadwick sono grandi e pesanti, I neutroni di Pauli sono piccoli e leggeri, essi debbono essere chiamati neutrino".