Where does “someone” come from?

Someone comes from Middle English som + on, where on derives from Old English ān, from Proto-Germanic andi, ultimately from Proto-Indo-European sem- meaning "one."

someone (English): Some person; A partially specified but unnamed...

Definitions

  1. Some person; A partially specified but unnamed...

Ancestry of “someone”, step by step

someone traces back through two separate lines of ancestry.

via English one

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

via English some

StepLanguageWordMeaning
1EnglishsomeA certain number, at least two; An indefinite...
2Middle Englishsomsome
3Old Englishsumsome
4Proto-West Germanic*sumsome
5Proto-Germanicsumazsome (one), a certain (one)
6Proto-Indo-Europeansem-together, one

Words derived from “someone

Every word from Proto-Indo-European -no-
someone — Etymology, Origin & Word History | Etymology Explorer