Answer
Baibars or Baybars is the more common spelling of the name of the Mamluk sultan, although he was originally named Al-Malik al-Zahir Rukn al-Din Baybars al-Bundukdari (), "King of Victory, Pillar of the Faith, Baybars the Stammerer". He was born in the Kipchak steppe, and his original name was Bundukdari.