The story
After Hermann Weyl, the person who proposed this fermion.
Etymology from Wiktionary, CC BY-SA 4.0.
Weyl fermion
Today it means: A massless quasiparticle and fermion, which carries electric charge, and cannot move backwards, that may exist in Weyl semimetals, where an electron can be split into two Weyl fermions which move in opposite directions, which can form an electron by combining two Weyl fermions. Full definition →