Chasen is of American origin, derived from an Old French surname, Chaigne, which means 'oak grove.' It gained popularity in the United States during the mid-20th century and has since been used as a given name.
"Over the span of almost five decades (1975-2023), the name Chasen has seen varying popularity, with a significant increase starting around 1982 and peaking between 1988 and 1994. However, since then, its usage has fluctuated, experiencing recent years with fewer births compared to earlier decades."