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English word muon comes from English meson, English mu (The 12th letter of the Modern Greek alphabet.)
meson (English)
(now specifically, particle) An elementary particle that is composed of a quark and an antiquark, such as a kaon or pion. (Mesons composed of rarer quarks are much heavier.). (obsolete) A member of a group of subatomic particles having a mass intermediate between electrons and protons. (The most easily detected mesons fit this definition.).
mu (English)
The 12th letter of the Modern Greek alphabet.
mu-meson (English)
(dated) A muon (kind of subatomic particle).
muon (English)
An unstable elementary particle in the lepton family, having similar properties to the electron but with a mass 209 times greater.