Jesus is said to have used the Aramaic word ABBA in the Lord's Prayer. The word was perhaps used by children to address their father and was similar to what toady's children address their father as Daddy. In a few languages besides English, I have seen that the word used is the one which has more formal and literary usage than the word Daddy which in many ways expresses the bond between the children and their earthly father.
I would like to know what exactly the word used to address the Heavenly Father in the Lord's Prayer in ancient English was. Are there any authentic studies available from the side of Catholic Church on the passage, from ancient times to the modern, of the Lord's Prayer with specific reference to the way of addressing it uses ?