Kultapyörä

Hyytämöinen and Lievetyinen

Names: Of the Winter Son:
Talvipoika Hyyhäröinen (no region known)
Talvipoika Hyytämöinen
Talvipoika Hyytämöisen
Talvipoika Hyytömöisen
Talvipoika Höyetyinen
Talvipoika pohjalaisen
Talvipoika ärjentä

Of the Summer Weather:
Susi ilman Liepuluinen
Suven ilman Lieputuinen
Suvi-ilma Liepotoinen
Suvi-ilma Lievetyinen
Suvi-ilman Liehemoinen
Suvi-ilman Liepotuinen
Suvi-ilman Lievotuinen
Suvi-ilman Liuvutuinen
Domain: Winter and summer

These are the winter boy and the summer boy. You could see them as personifications of the winter and summer.

Hyytämöinen (winter) is mentioned more often, in incantations against frost, asking the winter and frost not to freeze the person too much. Most mentions of Lievetyinen appear in those incantations as well, though removed from its original context.

The main mythic appearance of these figures is in the runosong the Awakening of Sämpsä. Hyytämöinen first appears bringing winter. Then, Ahti asks someone to go and awaken Sämpsä. A wolf gives it an attempt, but Ahti doesn't like his vicious nature. Then, Lievetyinen goes and finds Sämpsä on an island with no trees and wakes him up. Sämpsä thanks him because as he came to Sämpsä, he had already thinned ice and started spring.

An Ingrian (also Karelian?) variant of the myth is considerably more violent as the winter boy is killed first and only then, the summer boy goes to wake up Sämpsä.

Etymology

Talvipoika Literally "winter son" or "winter boy".
Suvi-ilma, variants Literally "summer weather". Suvi-ilman is "of the sumnmer weather" and suven ilman is "of the weather of the summer". Form susi "wolf" appears a couple of times but doesn't seem to be the original intention.
Hyytämöinen, variants From hyytää "to chill".
Talvipoika pohjalaisen Winter son of someone from Pohjola.
Ärjentä Seems to refer to cold, northern wind.
Lievetyinen, variants Difficult to say. Possibly related to lievä "mild", and lieventää "to ease".

Runosongs of interest

Only in Finnish, sorry. This is the source material.