Where does “ugens,ugans,vgons” come from?
ugens,ugans,vgons (Middle Cornish) comes from Proto-Brythonic ʉgėnt, from Proto-Celtic wikantī, from Proto-Indo-European h₁wih₁ḱm̥t, from Proto-Indo-European dwi(h₁)dḱm̥ti — two tens; two decades; twenty; two-ten.
Ancestry of “ugens,ugans,vgons”, step by step