What are the major gods in Russian mythology?

Answer 1

well here's is a reference so you can be better informed;
In the ancient Russian mythology Dazhdbog appears as a son of the Almighty Perun ... make a note that mermaids in Russian...
www.ibiblio.org/sergei/Dazhdbog.html

Answer 2

The following inventory and discussion of Russian pagan gods is taken from Linda Ivanits, Russian Folk Belief, Armonk: M. E. Sharpe, 1989. Russian words are transliterated according to the Library of Congress system, with the stressed vowel indicated by bold type. Numbers in parentheses are page references to Ivanits's book.

Dazhbog
sun god, also god of blessings and son of Svarog; Iranian influence (13)
Iarilo
minor god of male sexual potency (14); associated by Rybakov with semik (17)
Khors
sun god; Iranian influence (13)
Koliada
spirit of the winter solstice (14)
Kupalo
spirit of the summer solstice, associated with Kupalo's Day (June 24) (14)
Lada, Lado
variously thought to be the mother of Lel' and Polel', a god of the underworld and marriage, or not a deity at all (14); Rybakov considers her the goddess of spring and mother of Lelia (17)
Lel'
possibly the son of Lada and brother of Polel' (14)
Lelia
possibly the daughter of Lada (17)
Mat' syra zemlia
Moist Mother Earth, personification of the earth as a female deity (15)
Mokosh'
only female deity included among Vladimir's idols, possibly associated with Moist Mother Earth (14); Rybakov associates her with fertility, bounty, mositure, women's work, the protection of maidens (16), October 28 (Saint Paraskeva-Friday) (17, 35)
Perun
chief of the pagan gods, god of thunder and lightning and of war (13); Rybakov associates him with July 20 (Elijah the Prophet) (17)
Polel'
possibly the son of Lada and brother of Lel' (14)
Rod
minor god of birth (14); Rybakov sees him as an early primary god of the east Slavs, a creater and god of fertility and light, associated with the winter solstice and July 20, who was replaced by Perun shortly before the tenth century (17)
Rozhanitsy
minor goddess of birth (14); Rybakov associates her with the harvest (September 9) (17)
Simargl
a winged dog, guardian of seed and new shoots; Iranian influence (13); associated by Rybakov with rusal'naia week (17)
Stribog
possibly god of wind, storm, and destruction; Iranian influence (13)
Svarog
sun god, father of Dazhbog, divine smith (13)
Svarozhichi
sons of Svarog (13)
Sviatovit
possibly an important god of the west Slavs, god of light, bounty, and divination regarding the harvest (14)
Volos, Veles
god of cattle (skotnyi bog), commerce and possibly the dead (14), associated by Rybakov with the winter solstice and spring equinox (17)

hope that's at least some help

Answer 3

Booze and laziness