*Kolabotn (Old Norse) comes from Old Norse botn, from Proto-Germanic butmaz, from Proto-Indo-European bʰudʰmḗn, from Proto-Indo-European dʰewbʰ-, from Proto-Indo-European dʰewh₂- — smoke; mist, haze.
Ancestry of “*Kolabotn”, step by step
*Kolabotn traces back through two separate lines of ancestry.