Mirror universe
"My sister loved you. Say her name and beg for forgiveness."
Ava was a female Terran in the mid-23rd century. She was killed during the rebellion of Lorca.
Deeming Lorca responsible for her death, her brother, Captain Maddox, tortured Lorca before being killed by the rebels. (DIS: "Vaulting Ambition")
This character was only mentioned in dialogue.
StarTrek.com identified Ava – no last name is given – as a cadet aboard the ISS Buran. She was a former lover of Lorca. [1](X)