It isn’t pagan, for it is found in the Bible. He who speaks from the burning bush says of Himself that He doesn't have just one Name. In other words, the Father has no proper Name. It is not a figure of speech, but rather a function. The Father has as many names as the function has props.
What is its function? The religious function par excellence, that of tying things together. What things? The signifier and the signified, law and desire, thought and the body. In short, the symbolic and the imaginary. Yet if these two become tied to the real in a three-part knot, the Name-of-the-Father is no longer anything but mere semblance. On the other hand, if without it everything falls apart, it is the symptom of a failed knotting.