 Other names for Ukko include "Pitkänen" ("pitkä", "long"), "Isäinen" ("isä", "father"), "Isoinen" ("iso", archaic form of the above, modern meaning "great", "big" or "large").Although portrayed active in myth, Ukko makes all his appearances in legend solely by natural phenomena when appealed to.According to Martti Haavio, the name Ukko was sometimes used as a common noun or generalised epithet for multiple deities instead of denoting a specific god.