Proto-Baltic: *per̃kū̂n-a-, *per̃kō̂n-a-, *per̃kaũn-a- m.
Meaning: thunder, thunder-god
Lithuanian: perkū́na-s 'Donner, Blitzschlag; Donnergott'
Lettish: pḕrkuôns, pḕrkuonis, pḕrkàunis, pę̄̀rkauns 'Donner; Donnergott'
Old Prussian: percunis `Donner' V. 50