Magnus Chase is the main character in the series named after him: Magnus Chase and the Gods of Asgard.
Magnus is a child of Freyr and lives in Boston, Massachusetts.
Magnus is a latin name meaning "great". It became popular in Scandinavia after the time of the 11th-century Norwegian king Magnus I.
Chase is a middle english surname, an occupational name for a hunter. In middle english the word "chase" means "hunt".