Where does “oneself” come from?

Oneself derives from English self and one, with one tracing to Middle English -s, Old English ān, and Proto-Indo-European en, ultimately from Proto-Indo-European ḱeh₃i-.

oneself (English): A person's self: general form of himself, herself...

Definitions

  1. A person's self: general form of himself, herself...

Ancestry of “oneself”, step by step

oneself traces back through two separate lines of ancestry.

via English one's

StepLanguageWordMeaning
1Englishone'sBelonging to one
2EnglishoneThe number represented by the Arabic numeral 1;...
3Middle EnglishoneAlternative form of on; Alternative form of hone;...
4Middle Englishonento unify; to join together; to gather together;...
5Middle English-enDenotes the past participle form when attached to...
6Old English-enmæġþ + API → mæġden; cocc + API → cycen, cicen;...
7Old Norse-innUsed to create adjectives from nouns, meaning...
8Proto-Norse-īna-
9Proto-Germanic-īnaz-en
10Proto-Indo-European-iHnosCreates adjectives of materials
11Proto-Indo-European-no-adjectival suffix

via English self

StepLanguageWordMeaning
1EnglishselfHimself, herself, itself, themselves; that...
2Middle Englishsulf
3Old Englishsylfself, oneself
4Old Englishselfself; oneself, personally
5Proto-West Germanic*selb
6Proto-Germanicselbazself
7Proto-Indo-Europeanselbʰ-one's own
8Proto-Indo-Europeans(w)e-separate, apart; separate; apart; oneself; one's...
9Proto-Indo-Europeanswéself
Every word from Proto-Indo-European -no-