Mårtensson, Martensson, Mårtenson and Martenson are surnames. Notable people with the names include: Agneta Mårtensson (born 1961), Swedish freestyle swimmer. Anders Mårtensson (1893–1973), Swedish vaulter who competed in the 1920 Summer Olympics. Beata Mårtensson-Brummer (1880–1956), Swedish artist. Benny Mårtensson. Bertil Mårtensson (1945–2018), Swedish author of science fiction, crime fiction and fantasy; also an academic philosopher. Bodil Mårtensson (born 1952), Swedish author of crime novels and adventure books.
https://en.wikipedia.org/wiki/M%C3%A5rtensson