Charles H. Spurgeon on Psalms 99:3

Thy great and terrible name; for it is holy. The FATHER'S name is "great, "for he is the source, the Creator, the Lord of all; the SON'S name is "terrible, "for he is to be our judge; the name of the HOLY GHOST is "holy, "for he it is who bestows hallowing and sanctification. The Hebrew commentators see here the mystic Tetragrammaton hwhy, whose true pronunciation was kept a profound secret by the Rabbins, owing to a feeling of awful reverence; while the Greeks are precise in bidding us take it of that name, which is "terrible" to God's enemies, "holy" to his friends, and "great" to both, the name of JESUS. Hugo Cardinalis, Genebrardus, and Balthazar Corderius, in Neale's Commentary.