Saif means sword, and it is a popular boy's name since it refers to titles of certain special people and their bravery in battle. One person to which the name is attributable is Ali ibn Abi Talib (AS) who used a double-pronged sword called thul-fiqar. Ali was titled saif-ullah (Sword of God) by Prophet Muhammed (SAW). Another person the name could fall upon is Khalid bin Waleed, but the title Saif-ullah was given to him by Abu Bakr, the first Khalif (leader) after Muhammed (SAW).