köken: Compound of berg (“bedrock; mountain”) + söta (“sweetness”). Latter half from the sweet, liquorice-like taste of their edible roots. First attested in 1638.
köken: kallio (“rock”) + imarre. The first part of the name refers to the plant's typical habitat in Finland, and the latter part of the name probably refers to the sweet taste of the rhizome of the plant, compare imelä (“sweet”), imarrella (“to flatter”).