Correct: both Michael and Micheal.
The name Michael comes from Hebrew and means roughly sent from God – the name is found in many forms all over the world. In English, the most common iteration of this name is spelled Michael, however, the spelling Micheal, despite being less common, may also be correct as it can be used by people of many cultural heritages.

Correct spelling

Michael

Correct spelling

Correct spelling

Micheal

Correct spelling