What is the old name of Sunday

Sunday's name in English derives from the Old English "Sunnandæg," which literally means "day of the sun," reflecting the ancient practice of naming days after celestial bodies and deities. This corresponds to "dies Solis" in Latin, maintaining the association with the sun that was prevalent in Roman and Germanic cultures. Before widespread Christian adoption, Sunday was dedicated to the sun god in various pagan traditions, and this astronomical naming convention persisted even as the day took on new religious significance.

In many Romance languages, Sunday's name reflects Christian reinterpretation rather than pagan origins—for example, Spanish "domingo," Italian "domenica," and French "dimanche" all derive from the Latin "dies Dominica," meaning "the Lord's day," emphasizing its Christian identity as the day of Christ's resurrection. This dual naming heritage—astronomical in Germanic languages and religious in Romance languages—illustrates how different cultures adapted weekday names to their own traditions while maintaining the seven-day week structure. Understanding these linguistic roots reveals how ancient timekeeping systems blended astronomical observation, religious practice, and cultural evolution into the calendar structure we use today. The persistence of "Sunday" in English represents the survival of pre-Christian naming conventions alongside Christian observance practices.