köken: From Middle Irish aerach (“airy, pleasant; light-hearted, gay, frivolous”); aer (“air”) + -ach. The sense ‘homosexual’ is a semantic loan from English gay.
köken: Etymology tree Proto-Indo-European *h₂ews- Proto-Indo-European *h₂ewsér Proto-Hellenic *auhḗr Ancient Greek ᾱ̓ήρ (āḗr)bor. Latin āērder. Esperanto aero Esperanto -a Esperanto aera From aero + -a.