Where does “o” come from?

o (Finnish) comes from Swedish ö, from Old Swedish ø, from Old Norse ey, from Proto-Norse *ᚨᚢᛃᚢ, from Proto-Germanic awjō, from Proto-Germanic agwjō, from Proto-Indo-European h₂ékʷeh₂ — water.

Ancestry of “o”, step by step

o traces back through two separate lines of ancestry.

via Swedish ö

StepLanguageWordMeaning
1Swedishöisland
2Old Swedishøa letter of the Old Swedish alphabet, written in the Latin script
3Old Norseeyalways, ever; island
4Proto-Norse*ᚨᚢᛃᚢ
5Proto-Germanicawjōfloodplain; meadow; island
6Proto-Germanicagwjō
7Proto-Indo-Europeanh₂ékʷeh₂water

via German o

StepLanguageWordMeaning
1GermanoO#Particle

Words derived from “o

Every word from Proto-Indo-European h₂ékʷeh₂