The name of the chief angel guarding over Hell is Malik, as mentioned in the Quran:
“Surely, the disbelievers will be in the torment of Hell to abide therein forever. (The torment) will not be lightened for them, and they will be plunged into destruction with deep regrets, sorrows and in despair therein. We wronged them not, but they were the wrongdoers. And they will cry: ‘O Malik! Let your Lord make an end of us’ He will say: ‘Surely, you shall abide forever.’ Indeed We have brought the truth to you, but most of you have a hatred for the truth” (Quran 43:74-78)