Adam Clarke Commentary
He that is mighty hath done to me great things – Or, miracles, μεγαλεια . As God fills her with his goodness, she empties herself to him in praises; and, sinking into her own nothingness, she ever confesses that God alone is all in all.
Holy is his name – Probably the word which Mary used was חסד chesed, which though we sometimes translate holy, see Psalm 86:2; Psalm 145:17, yet the proper meaning is abundant goodness, exuberant kindness; and this well agrees with the following clause.