sourcesource

Source comes from Old French sorse ‘rise, spring’, from sordre ‘to rise’, from Latin surgō ‘to rise’, ultimately from Proto-Indo-European *h₃reǵ-.

1. Proto-Indo-Europeanc. 4500–2500 BCE*h₃reǵ-¹‘to straighten’reconstructed
2. Proto-Indo-Europeanc. 4500–2500 BCE*h₃réǵeti²‘to straighten’reconstructed
3. Latinc. 75 BCE–200 CEregō²‘to lead, rule’
4. Latinc. 75 BCE–200 CEsurgō²‘to rise’
5. Old Frenchc. 842–1400sordre²‘to rise’
6. Old Frenchc. 842–1400sors²
7. Old Frenchc. 842–1400sorse²‘rise, beginning, spring, source’
8. Middle Englishc. 1150–1500sours²
9. Englishearliest quotation 1969source²

1. ¹ Wiktionary, Proto-Indo-European *h₃réǵeti
2. ² Wiktionary, English source
3. Earliest quotation in Wiktionary’s entry: 1969, 1969 May 28, A View of the O-erh-ch'i-ssu River Delta: “The O-erh-ch'i-ssu River begins in the southern section of…”.