Rougir is the third of five foals of racing age out of Summer Moon (Elusive City), who was second in the Listed Prix Coronation in France. Summer Moon is also the dam of Svenson (Blame), a winner on the Flat and over hurdles, and Rougir is one of 24 black-type winners out of daughters of Elusive City. Summer Moon is a half-sister to three winners, one of them French and two successful in Turkey.

Second dam Kalatuna (Green Tune) was Group-placed.

Third dam Kalasinger (Chief Singer) won at Listed level in Belgium and had five winners, among them the Listed-placed Rocky Reef (Mtoto).

Fifth dam Kalkeen (Sheshoon), a Listed winner, is the dam of Karkisiya (Caro), a Group 3 winner, and the second dam of the sire Kahyasi, a dual Classic winner, and of Key Change, winner of the Gr.1 Yorkshire Oaks. She is also an ancestress of the Group 1 winners Milan and Kastoria.

Summer Moon's last reported foal is a 2-year-old filly by Style Vendome named Rosir.