It is the name of a figure in Greek mythology. Leda was a Spartan queen who was seduced by Zeus, who transformed himself into a swan. She laid two eggs, which hatched into the twins Castor and Pollux, and the twin goddesses Helen of Troy and Clytemnestra.
Therefore, "Leda" in English would simply be the name "Leda". It might also be associated with the mythological story of Leda and the swan.