köken: Inherited from Old Spanish alguien and the variations algui (c. 1260) and alguién (c. 16th c., but probably earlier). First attested in the form alguien in a 1247 document from San Esteban de Nogales. Two main etymologies have been suggested: * As a variant of alguno under the influence of, or conflated with, quien; probably originally being pronounced alguién (cf. Portuguese alguém, Galician…
köken: From late Old Swedish naghan, from earlier nokon, accusative of Old Swedish nokor, from Old Norse nǫkkurr, from Proto-Norse *ne-wait-ek-hwarjaʀ (literally, "not-know-I-who"). Cognate with Norwegian Nynorsk nokon, Danish nogen, Faroese nakar, Icelandic nokkur, Norwegian Bokmål noen.
köken: Inherited from Prakrit 𑀓𑁄𑀇 m sg (koi, “someone, something”, nominative). See there for more. Cognate to Awadhi कोई (koī), Braj कोऊ (koū), Punjabi ਕੋਈ (koī), Gujarati કોઈ (koī), Marathi कुणी (kuṇī), Bengali কেউ (keu), Bhojpuri केऊ (kēū), Assamese কেও (keü), Sinhalese කොයි (koyi). Originally the masculine nominative singular form of a paradigm whose neuter form became कुछ (kuch) and genitive form…
köken: jo- (relative pronoun) + ku- (“who”). Originally an old compound of two pronominal stems, but is practically never considered a compound by speakers.