nadie.

Inherited from Old Spanish nadi, nade (“no one”), inherited from Latin nātī (“born men/people”), perfect past participle of nāscor (“to be born”), ultimately derived from Proto-Indo-European *ǵenh₁-. The semantic change is due to commonly being used with negated verbs in spoken Ibero-Romance, supposing for example *nātī nōn fēcērunt (“born [people] did not do it”), cognate with Old Galician-Portuguese nado (“no one”). Compare the development of French personne from “person” to “no one”. Old Spanish commonly also used the phrase omne nado. Nada (“nothing”) also originates from the same root, from (rēs) nāta (“born thing”); see Jespersen's Cycle. The final unstressed vowel was influenced by quién/quien and alguién (today alguien) towards the very end of the Old Spanish period: the earliest attestation of the -ie form is from c. 1253 in a Spanish translation of Syntipas known as Sendebar.

Inherited from Old Spanish nadi, nade (“no one”), inherited from Latin nātī (“born men/people”), perfect past participle of nāscor (“to be born”), ultimately derived from Proto-Indo-European *ǵenh₁-. The semantic change is due to commonly being used with negated verbs in spoken Ibero-Romance, supposing for example *nātī nōn fēcērunt (“born [people] did not do it”), cognate with Old Galician-Portuguese nado (“no one”). Compare the development of French personne from “person” to “no one”. Old Spanish commonly also used the phrase omne nado. Nada (“nothing”) also originates from the same root, from (rēs) nāta (“born thing”); see Jespersen's Cycle. The final unstressed vowel was influenced by quién/quien and alguién (today alguien) towards the very end of the Old Spanish period: the earliest attestation of the -ie form is from c. 1253 in a Spanish translation of Syntipas known as Sendebar.