Dark-haired or coal-black
Derived from an Old Norse surname, it originally referred to a farmstead belonging to a person named Koli. The name Koli itself is a nickname for someone with dark features, stemming from the word for coal.
Less common today
Kolby isn't in the latest US Top 1000. It last peaked at #359 in 2001.
US births per 5-year period, 1990–present (SSA data).
NFL wide receiver
Country music singer-songwriter
Major League Baseball pitcher
