National Sunday Day is celebrated on October 18 and is recognized in many Western cultures as a day of rest, marking the first day of the week. For Christians and Catholics, it is a significant day for worship, often involving dressing in "Sunday finest" and attending church services. The name "Sunday" derives from the Old English term "sunedai," which means "day of the sun," reflecting its connection to the sun rather than its religious significance. The surname "Sunday" has historical roots in England, originating from families living near sandy areas, with the earliest records found in Worcestershire. The observance of National Sunday Day highlights the cultural importance of Sunday as a day dedicated to relaxation and spiritual reflection.