Etain is a Jedi Padawan who appears in the book Republic Commando: Hard Contact.
She is described as being a thin and plain-looking girl, and was probably in her late teens at the time of the Qiilura mission. Her Master was a Jedi by the name of Kast Fulier, but he was killed during the mission, leaving her alone until Omega Squad showed up. She assisted them in capturing the scientist Ovolot Qail Uthan and destroying the nanovirus research facility. At the end of the mission, she remained behind on Qiilura with Jedi Master Arligan Zey.
Etain Tur-Mukan @ Star Wars Wiki