I think there are two "problems": the two X's.
Siouxsie like SiouZie (since her first name is Susan)
or
Siouxsie like SiouXie (X like in fox)
Sioux like Siou
or
Sioux like SiouX (X like in fox)
(I hope this point hasn't been addressed in this mail list too many times...)
Daniel