Bertil is a first name of Germanic origin most commonly found among Swedish men. The oldest recorded use is from the year 1396, but the name did not come into widespread use until the 19th century. People called Bertil include: Carl Bertil Agnestig (1924–2019), Swedish music teacher and composer. Bertil Ahlin (1927–2008), Swedish bantamweight boxer. Bertil Albertsson (1921–2008), Swedish runner. Bertil Almgren (1918–2011), Swedish archaeologist. Bertil Almqvist (1902–1972), nicknamed Bertila and Trallgöken, Swedish author and illustrator. Bertil Anderberg (1913–1991), Swedish film actor.
https://en.wikipedia.org/wiki/Bertil