What does Saif mean?
From sayf (س-ي-ف), meaning 'sword'. Often appears in the compound Sayf Allah ('Sword of God'), a title given to Khalid ibn al-Walid. Also spelled Sayf or Seif.
What does Hadi mean?
From the root h-d-y (ه-د-ي, 'to guide, to lead rightly'), meaning 'guide, leader, one who directs to the right path'. Al-Hadi is also one of the names of God; as an everyday human given name it is common and is presented here in that sense.