Freyr

Likely wrong and an especially bad example of sun worship. Aesir belief wasn’t particularly interested in the sun and seldom personified it, as opposed to earlier mythology.

After all, their creation belief is refreshingly simple:

According to the Prose Edda, Odin, the first and most powerful of the Aesir, was a son of a giant (Bor) and a giantess (Bestla), who, along with his brothers Ve and Vili, cast down the terrible frost giant Ymir. From his corpse, the three created the cosmos, transmuting his various body parts into sky, seas, and land:

From Ymir’s flesh, the brothers made the earth, and from his shattered bones and teeth they made the rocks and stones. From Ymir’s blood, they made the rivers and lakes. Ymir’s skull was made into the sky, secured at four points by four dwarfs named Nordi, Sudri, Austri, and Westri (North, South, East, and West). And from Ymir’s brains, they shaped the clouds and Ymir’s eyebrows became Midgard, the place where men now dwell.[12]

In this account, Odin and his brothers are also attributed with creating mankind from hollow logs. In doing so, Odin first gave them breath and life; Vili gave them brains and feelings; and Ve gave them hearing and sight. The first man was named Ask and the first woman was Embla, and from them all families of mankind are descended. [New World Encyclopedia]

The norse stories that named the sun was Vafthrúdinismál and Snorre’s Gylfaginning. [See the first link.] In both, Mundilfaeri had the “daughter” Sól and the “son” Máni. (Sun respectively Moon in Old Norse.)

Freyr was the god of fertility, harvesting and weather, all in one nice package. As such he had a secondary effect on the appearance of Sól and Máni.