Iesei was a Killik hive, according to Legends, that at one time existed on the world of Tatooine. Vector Hyllus and Cipher Nine came across them amidst the Cold War fought between the Galactic Republic and the Sith Empire. During the time of the Swarm War, the Iesei inhabited a desert planet that was attacked by the Chiss.
Within Star Wars: The Old Republic, both Vector Hyllus and Daizanna say the name of the nest as "Lesei", incorrectly reading the capital "I" as a lowercase "L". This is clearly an error, since all known Killik names are in fact palindromes.