Ambrosia "Sia" Terpsichore Adrasteia de Mauvaisefoi Sia is the eldest daughter to Ambrose de Mauvaisefoi and Catarina Guerrero, and the step-daughter to Euporie Blackrose. Ambrosia is named after her father Ambrose, as per tradition of there family naming the firstborn daughter. Ambrosia is the older sister to Circe, Draco, Amphitrite, and Nais, and younger to Eridanus.
Ambrosia is the half-sister to Persephone, Galatea, Asterion, Theseus, Icarus, twins Melanie and Phoebe, and Sterope. Nais is the half-sister to her father's bastards Antonia, Sebastian, Silas, Rein, Trinity, Seth, and Adonis.
Ambrosia is the feminine form of Ambrosios or Ambrose is from the Late Latin name Ambrosius, which was derived from the Greek name Αμβροσιος (Ambrosios) meaning "immortal". Saint Ambrose was a 4th-century theologian and bishop of Milan, who is considered a Doctor of the Church. Due to the saint, the name came into general use in Christian Europe, though it was never particularly common in England.
Terpsichore means "enjoying the dance" from Greek τερψις (terpsis) "delight" and χορος (choros) "dance". In Greek mythology she was the goddess of dance and dramatic chorus, one of the nine Muses.
Adrasteia is the feminine form of Adrastos. In Greek mythology this name was borne by a nymph who fostered the infant Zeus. This was also another name of the goddess Nemesis. Adrastos means "not inclined to run away" in Greek. This was the name of a king of Argos in Greek legend.
Her surname is Mauvaisefoi means 'bad faith' in French.