Which of the following names is least likely to be associated with the Spartoi?

The Spartoi are a group of warriors in Greek mythology who sprang from the teeth of a dragon slain by Cadmus. They are typically associated with the founding of Thebes and are known for various names, most of which are linked to their legendary origins and roles in battles.

Udaeus, Echion, and Chthonius are all names directly associated with the Spartoi. Udaeus and Echion are among the better-known Spartoi, often noted for their valor and participation in various mythological tales surrounding Thebes. Chthonius, while less prominent than the first two, is also recognized as one of the warriors that emerged from the dragon's teeth.

Perseus, on the other hand, is a distinct character in Greek mythology, famously known for his slaying of Medusa and adventures such as rescuing Andromeda. His stories do not relate to the Spartoi or Theban myths but rather belong to the broader category of hero legends. This separation from the Spartoi makes Perseus the least likely name to be associated with them.