köken: With irregular stress shift (as in Holunder, lebendig, etc.) from Middle High German forhel, alteration of older forhen, from Old High German forhana, from Proto-Germanic *furhnō, from Proto-Indo-European *perḱ- (“speckled”).
köken: From qızıl (“red”) + ala (“variegated”). Compare Turkmen gyzyl-ala (“motley, multi-colored (with a predominance of red)”), Chagatai قزل الا (qzl ʾlā /qızıl ala/, “trout”), Armeno-Kipchak խըզըլալաճապալըխ (xəzəlalačapaləx, “trout”), and Armenian կարմրախայտ (karmraxayt, “trout”, literally “red-spotted”).
köken: Borrowed from German Forelle, from Proto-Germanic *furhnō. The fish is spotted, hence the name. Compare Sanskrit पृषत् (pṛṣat, “spotted”), Ancient Greek περκνός (perknós), πέρκη (pérkē).
köken: From Old Norse aurriði, from aurr (“gravel”) + the verb ríða (“to ride”), meaning something like "one who rides on stones and gravel". Compare Norwegian Nynorsk aure, Swedish öring and Norwegian Bokmål ørret.
köken: From cá (“fish”) + hồi, the latter is a Sino-Vietnamese word from Chinese 回 (huí, “to return”), so called for the way they "return" upstream to spawn.
Etimoloji
From Old Irish brecc (“speckled, spotted; trout”), from Proto-Celtic *brikkos. Cognate with Breton breac’h and Welsh brych. The verb is from Middle Irish breccaid (“to speckle”), from the adjective.