Laufey is a "she" in the myths. She's Loki's mom. His father was Farbauti, and guess what? Marvel turned him into Loki's mom instead, effectively swapping his parents' names. Why? My guess is that they saw Loki was called Loki Laufeyson in some myths and assumed that, like other Norse surnames, that meant Laufey was his father. Except Loki has a matriarchal surname for some reason that I never actually learned. So the names got switched.
But as far as the comics--which are what the movie is adapting, not the myths--go, Laufey has always been Loki's father and Farbauti has always been his mother, so it's a gender-swap once removed. Stan Lee, Jack Kirby, and possibly Larry Leiber (Stan's younger brother who scripted a lot of early Thor appearances) are the ones who got it wrong all those decades ago.