Agreed with Patrick on the sword part. Saif al-Jin bin Nar, or Sword of the Jinn, son of fire/flame.
Pronunciation would be pretty much Saif al-jean (like pants), bin Nar. And if you're interested, it would be written سيف الجين بن نار.
If you prefer, other words you could substitute for Nar are "niran," (neeran) which is flames, or "hariq," (hareeq) which is more like a massive fire like a forest fire.
Hope this helps!