To what extent is it permissible to name a football team "The Red Devils"?

It is not permissible to call oneself or a group "Satan," because it is the name of God's disbelieving enemy, and it is derived from "shatan," meaning distance from good. Among the meanings of "Shaytan" (Satan) is every rebellious, defiant one from humans, jinn, and animals. Furthermore, this usage diminishes the danger and vileness of Satan in the eyes of the youth, and promotes great corruption.