Albert Barnes on Luke 1:49

He that is (v) mighty. God.

Hath done to me (w) great things. Hath conferred on me great favours and distinguished mercies.

And holy (x) is his name. This is an expression of Mary's feelings, desiring to bestow on God all honour and praise. As the highest honour, she declared that his name was holy--that is, that God was free from sin, injustice, and impurity. The "name" of God is often put for God himself. The proper name of God is Jehovah, a word expressive of his essential being, derived from the word to be, Ex 3:14; 6:3; Ps 83:18. That name is holy; is to be regarded as holy; and to make a common or profane use of it is solemnly forbidden, Ex 20:7.

(v) Gen 17:1 (w) Ps 71:21, 126:2,3, Eph 3:20 (x) Ps 111:9