Colbie is a feminine spelling of Colby, an English surname and place name from Old Norse that means "Koli's farm" or, by the usual reading of the personal name, "dark-haired". Singer Colbie Caillat, whose hit Bubbly came out in 2007, made the spelling familiar to American parents. Colbie hovered just outside the top 1000 for years, at number 1107 in 2024, and entered the list for the first time in 2025 at number 881.