National Marvin Day is celebrated on May 18 each year, honoring individuals named Marvin. The name Marvin is predominantly masculine, of Welsh origin, and means "Sea Hill." It has seen a decline in popularity since peaking in the early 1930s, coinciding with the birth of music legend Marvin Gaye. In the United States, the name ranks 293rd in popularity, with a significant prevalence among Caucasians. Typical activities for National Marvin Day include learning about the name Marvin, becoming friends with someone named Marvin, and spreading awareness of the day. The state with the most people named Marvin is California, while Iowa has the highest concentration per capita.