Latvian pērkons

← Proto-Balto-Slavic *Perkūnas (inherited)

← Proto-Indo-European *perkʷunos (inherited)

← Proto-Indo-European *pérkʷus (mention)

← Old Prussian Perkūns (cognate)

→ Estonian põrgu (cognate)

→ Latvian pirkt (mention)

→ Latvian Pērkons (mention)

→ Moksha атям (cognate)

→ Polish piorun (cognate)