Because the prayer was taught to the people by Jesus (who is believed by Christians to be God or Lord, as one of the three in The Trinity, the unity of "The Father, Son, and Holy Ghost").
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It is called "the Lord's Prayer" because it was Our Lord Jesus who said it first.
The lords prayer learn you how to pray, it honor him, tell who he is, giving us what we need and asking for forgiviness
It is the Lords prayer.
The Lords prayer can be found in Luke 11:1-4 & Matthew 6:9-13.
See the link below.