Levias

Levias is a character from The Legend of Zelda: Skyward Sword. It is an enormous whale-like creature that has protected the skies since ancient times. Link finds Levias in the Thunderhead, where it has been infected by Bilocyte. After Link frees him from the Bilocyte he tells him about the four parts of the Hero's song. After learning all four parts of the Hero's song, Link returns to Levias, at which point he teaches him the last part of the Hero's song.

Etymology
It is possible that "Levias" is derived from Leviathan, a giant sea creature from the Bible. In contemporary literature, the term Leviathan is often used in reference to large, aquatic creatures, such as whales. The name also sounds similar to the word "Levitate," which means to float in the air.