KAYLA: 'Cuz she used to have a lover.
LOGAN: Ohhh. You tell this to the kids?
KAYLA: His name was Keukuatsheu and they lived in the Spirit World together.
LOGAN: Oh, this is a true story.
LOGAN: All right.
KAYLA: And every night, they would wander the skies together.
KAYLA: But, one of the other spirits was jealous.
KAYLA: Trickster wanted the moon for himself, so he told Keukuatsheu that the moon had asked for flowers.
KAYLA: He told him to come to our world and pick her some wild roses. But Keukuatsheu didn't know that once you leave the Spirit World, you can never go back.
KAYLA: And every night, he looks up in the sky, and sees the moon, and howls her name.
KAYLA: But...he can never touch her again.
LOGAN: Wow. "Koo-koo-ka-choo" got screwed.
KAYLA: It means "the Wolverine."
I presume this legend is made up. I couldn't find any evidence of it on the Web. But I was pleasantly surprised to find the name "Keukuatsheu." It's really a Native word for "wolverine." I gather it comes from the Innu of the Quebec-Labrador region.
Information about Kuekuatsheu (Gulo gulo, carcajou, wolverine)
Wolverine myths and historical references
Leacock, Eleanor B. and Nan A. Rothschild (eds.). 1994. Labrador Winter: the Ethnographic Journals of William Duncan Strong, 1927-1928. Washington, D.C.: Smithsonian Institution. pp.67-68.
Kuekuatsheu Kutukuaniutshuahp, Quebec, Canada
Anyway, kudos to Wolverine for using a tiny bit of genuine Native lore. For more on the movie, see Debating Lynn Collins as Silver Fox and Wolverine Trailer.