[9] Ukko is considered to be the most significant god of Finnish mythology, although it is disputed by scholars whether this is accountable to later Christian influence.

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, when appealed to Ukko makes all his appearances in legend solely by natural phenomena.

[10] 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.

[12] Tuuri is rarely encountered in Finnish mythology, and had been relegated to the mere role of deity of harvest and success.

The Sami worshipped a similar deity, called Aijeke, probably as result of cultural cross-contamination or common origin.

Ukko's weapon was largely comparable to the Norse Mjölnir, and Iron Age emblematic pendants depicting hammers and axes similar or identical to Scandinavian specimens have been unearthed in Finland.

Like Mjölnir, Ukko's weapon has been linked by some to the boat-shaped battle axes of the Corded Ware culture.

[14] The name Ukon vaaja was also used of Neolithic stone tools such as battle axes, which were employed as thunderstones to be buried at the corners of dwellings Thunderstorms were sometimes interpreted as result of Ukko copulating with his wife Akka lit.

[6] Rauni, a vaguely defined being has been hypothesised to be cognate to Germanic words for the rowan tree through Old Norse: *raunir.