Whether this name "Holy Ghost" is the proper name of one divine person?

❌ Objection 1 : It would seem that this name, "Holy Ghost," is not the proper name of one divine person. For no name which is common to the three persons is the proper name of any one person. But this name of 'Holy Ghost' [*It should be borne in mind that the word "ghost" is the old English equivalent for the Latin "spiritus," whether in the sense of "breath" or "blast," or in the sense of "spirit," as an immaterial substance. Thus, we read in the former sense (Hampole, Psalter x, 7), "The Gost of Storms" [spiritus procellarum], and in the latter "Trubled gost is sacrifice of God" (Prose Psalter, A.D. 1325), and "Oure wrestlynge is . . . against the spiritual wicked gostes of the ayre" (More, "Comfort against Tribulation"); and in our modern expression of "giving up the ghost." As applied to God, and not specially to the third Holy Person, we have an example from Maunder, "Jhesu Criste was the worde and the goste of Good." (See Oxford Dictionary).] is common to the three persons; for Hilary (De Trin. viii) shows that the "Spirit of God" sometimes means the Father, as in the words of Is. 61:1: "The Spirit of the Lord is upon me;" and sometimes the Son, as when the Son says: "In the Spirit of God I cast out devils" (Mt. 12:28), showing that He cast out devils by His own natural power; and that sometimes it means the Holy Ghost, as in the words of Joel 2:28: "I will pour out of My Spirit over all flesh." Therefore this name 'Holy Ghost' is not the proper name of a divine person.

❌ Objection 2 : Further, the names of the divine persons are relative terms, as Boethius says (De Trin.). But this name "Holy Ghost" is not a relative term. Therefore this name is not the proper name of a divine Person.

❌ Objection 3 : Further, because the Son is the name of a divine Person He cannot be called the Son of this or of that. But the spirit is spoken of as of this or that man, as appears in the words, "The Lord said to Moses, I will take of thy spirit and will give to them" (Num. 11:17) and also "The Spirit of Elias rested upon Eliseus" (4 Kgs. 2:15). Therefore "Holy Ghost" does not seem to be the proper name of a divine Person.