Hofniel’s name is found in The Zohar. He is listed as one of Heaven’s ruling angels. He is the head of the Bene Elohim order. However, some sources consider Azazel the chief of the same order. The Zohar isn’t the only Jewish source to mention him. The Massekhet Azilut also mentions him. This anonymous work is a kabalistic work. This source also mentions the angel as the ruler over Bene Elohim.
You will not find any credible sources about the angelic being if you are a Christian. Only Jewish and Kabalistic sacred texts mention the angel. This angel is very attractive to those who practice the occult. Many Kabalstic angels, however, are not holy. Be aware!
While it isn’t clear if Hofniel is holy, you can find many mediums, psychics, and angelic messengers online who believe he is. They encourage you to pray for him. Prayers addressed to the angel will also be available. These prayers are meant to request the assistance of the angel. He will help you when you are too weak. In this case, you could call Archangel Micheal directly since He is stronger. You will feel more confident calling upon a holy celestial being.