Colsen is a modern spelling of Colson, an English surname that means "son of Col", Col being a medieval short form of Nicholas, "victory of the people". The -sen ending follows the pattern of Jensen and Carsen and gives the name a Scandinavian look. In the United States Colsen was rare at number 1835 in 2023, entered the top 1000 in 2024 and jumps to number 566 among boys' names in 2025, its best rank yet.