Michael (Arabic: ميخائيل ، مِيكَالَ ، ميكائيل, romanized: Mīkā'īl, Mīkāl or Mīkhā'īl)
I have not come across the idea that the angel Mika'il keeps the devil out of heaven in mainstream Shi'i or Sunni texts.
Also, the Qur'an says that God Himself threw the Shaytan (the devil) out of heaven. This is not to say that an angel could not have been involved; however, the Qur'an does portray it as being directly between God and Shaytan. It also implies that Shaytan accepted being thrown out insofar as Shaytan swore to misguide human beings until the end of time (and this oath implies that he is not trying to return to heaven).
Of course, God knows best!
A summary of what the angel Mika'il does as per Islamic texts can be found here: https://www.al-islam.org/ask/topics/4478/questions-about-Angel
Michael is the name of one of the greatest of Allah (SWT). It is mentioned in many books that Michael is responsible of Rizq and rain and plants. In Saheefa Sajjadia which is narrated from Imam Zainul Adibeen Al-Sajjad (AS) in the Du'a for the Angels of Alla : And Angle Michael, who has the great status with You, and the high degree in Your Obedience.
ميكائيل ذو الجاه عندك والمكان الرفيع من طاعتك ».
It is allowed to name our kids after the name of Michael.
The name of this great angle in Quran is Meekaal.ميكال (Sura 2, Verse 98).