Peter baptized in the name "Jesus" in Act 2 and in fact, every noted occurrence after that was done in the name, "Jesus". The disciples understood Jesus when He said, "...teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost.", that name of the Father is Jesus and the name of the Son is Jesus, and the name of the Holy Ghost is Jesus.
Acts 4:12 2 Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.
There is no salvation in this wording "Father, Son, Holy Ghost".