Ukko

Ukko, sometimes also Äijä or Äijö (Finnish: male grandparent, old man, also thunder), parallel in Estonian mythology to Uku, is the god of the sky, weather, harvest and thunder in Finnish mythology. The Finnish word for thunder, Ukkonen, is the diminutive form of the name Ukko. Ukko is often equated with Perkele, and some hold Perkele to be the original personal name of Ukko with the name Ukko being an euphemism. Ukko is held the most significant god of Finnish mythology, although it is disputed by scholars whether this is accountable to later Christian influence.