Jesus Christ (literally Jesus the Christ): Christ is not a personal name. Christ is a title that means "Messiah" or "God's chosen one."
pledged in marriage: In Judaism, engagement (or betrothal) was a permanent relationship (Malachi 2:14). It could only end through legal action. So, by law, Mary was Joseph’s wife and he was her husband (see Matthew 1:20; Deuteronomy 22:23–24). This was true even though they had not had sexual relations. Since Mary was a virgin when the Holy Spirit conceived Jesus, it proves Jesus’ divine nature.