The French word for daffodil is jonquille [ʒɔ̃.kij], which comes from the Spanish word junquillo (jonquil, rattan, strip of light wood, gold necklace), from junco [ˈxunko] (rush, reed, junk), from the Latin iuncus (rush, reed) [source].
The English word jonquil [ˈdʒɑŋkwəl/ˈdʒɒŋkwəl] refers to a fragrant bulb flower (Narcissus jonquilla), a species of daffodil, or a shade of yellow, and comes from the same Latin root, via French and Spanish [source].
The English word junk also comes from the same Latin root, via the Middle English junke (old cable, rope) and the Old French jonc (rush) [source].
In Danish and Norwegian a daffodil is a påskelilje, which means literally “Easter lily” [source]. In German they are called Osterglocke (“Easter bell”) or Narzisse (narcissus) [source].
By the way, I wrote a post about words for daffodil in English, Welsh and other Celtic languages a while ago.