Vega's first name, Ariadna, is not mentioned in the video games. This is pointed out by Richter at the end of High Treason. Her full name is mentioned in the Dale Brown novels.
In Act of War: Direct Action, Lieutenant Vega is portrayed by Lita Tresierra. Tresierra also provided the voice for the character Rosa in Assassin's Creed II. Sadly, she died in a road accident on June 21, 2010 in Montreal, Canada.[1][2]