A patronymic surname form meaning "son of Karl" (Karl = man), adapted as a modern given name in some families.
Karlson is a Scandinavian patronymic surname-turned-given-name, built from the Old High German *karal* — meaning "free man" or simply "man" — and the Norse suffix *-son*, meaning "son of Karl." The root Karl shares its ancestry with Charles, Carlos, and Carlo, all tracing back to the same Proto-Germanic stock that gave medieval Europe its most common royal name. In Scandinavia, the surname Karlsson was ubiquitous enough to become a cultural touchstone in its own right.
The name leapt into childhood imagination in 1955 when Swedish author Astrid Lindgren published *Karlsson på taket* (Karlsson-on-the-Roof), introducing a stout, self-satisfied little man with a propeller on his back who lived on a rooftop and befriended a lonely Stockholm boy named Lillebror. Lindgren's Karlsson is vain, gluttonous, and irresistibly charming — "the world's best Karlsson," as he perpetually announces — and the character became one of the most beloved in Scandinavian children's literature, spawning animated adaptations and stage productions across Northern and Eastern Europe. As a given name rather than surname, Karlson carries the warmth of that literary legacy alongside a quietly heroic resonance.
It sits comfortably in Nordic naming traditions while feeling distinctive enough to stand out in English-speaking contexts. Parents drawn to it often appreciate its sturdy, rooted masculinity and the hint of whimsy that Lindgren's immortal character lends to every syllable.