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How did the title Christ become part of the name Jesus Christ?

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Christology The Transfiguration, the nature of Jesus as the Son of God being revealed to the apostles Peter, James, and John, mosaic icon, early 13th century; in the Louvre, Paris.

The title Christ was not originally a name but a designation derived from the Greek word christos, which translates the Hebrew term meshiah (Messiah), meaning "the anointed one."12

During his lifetime, Jesus was typically identified by his father’s name or his place of origin, such as "Jesus son of Joseph" or "Jesus of Nazareth." After his death, his followers used the title the Christ to express their belief that he was the anointed descendant of King David expected to restore Israel.1

While early Christian writers recognized the Christ as a title, the term gradually merged with the proper name Jesus. Over time, the combination "Jesus, the Christ" evolved into the unified name "Jesus Christ," functioning much like a family name. This usage became standard, eventually superseding earlier variations such as "Christ Jesus," which more explicitly denoted "the Messiah Jesus."21